Rewrite the sentence:
I have to take the responsibility.

 

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An astronaut living in space begins a day in much the same way as he would on Earth.  The astronaut is able to brush his teeth and use the toilet in space. It is, however, rather challenging as the water droplets will (1) _________ around. The astronaut will also have to make to do with sponge baths.  There is a special plan for the astronaut on (2) _______ a spaceship which includes beverages and food items. The astronaut is allowed to have a maximum of three main meals a day. The meal varies each day until the sixth day. On that day, the menu is (3) _______ and the astronaut eats the meals he had on the first day. The food that is brought on a shuttle mission can be dehydrated, in natural (4) _________ for fresh. Sometimes, they are kept in thermostabilized cans or sealed pouches. It takes only thirty minutes to cook a delicious meal for a (5) ____________ of up to seven people on a space mission. However, astronauts have to eat slowly and carefully or the food will float away.

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We should do something to protect water from being polluted ………… we will have nothing to drink in the future.

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He often spend the evening _____________ fairy tales for his daughter.

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In Africa, people celebrate with joy the birth of a new baby. The Pygmies would sing a birth-song to the child. In Kenya, the mother takes the baby strapped to her back into the thorn enclosure where the cattle is kept. There, her husband and the village elders wait to give the child his or her name. In West Africa, after the baby is eight days old, the mother takes the baby for it’s first walk in the big, wide world, and friends and family are invited to meet the new baby. In various African nations, they hold initiation ceremonies for groups of children instead of birthdays. When children reach a certain designated age, they learn the laws, beliefs, customs, songs and dances of their tribes. Some African tribes consider that children from nine to twelve are ready to be initiated into the grown up world. They may have to carry out several tests. Masai boys around thirteen years old to seventeen undergo a two stage initiation. The first stage lasts about three months. The boys leave their parents’ homes, paint their bodies white, and are taught how to become young warriors. At the end of this stage, they have their heads shaved and they are also circumcised. The second stage, the young warriors grow their hair long and live in a camp called a manyatta where they practice hunting the wild animals that might attack the Masai herds. This stage may last a few years. When they are ready, they will marry and become owners of large cattle herds like their fathers. The girls are initiated when they are fourteen or fifteen. They are taught by the older women about the duties of marriage and how to care for babies. Soon after that they are married and lead a life similar to that of their mothers  
2. Where do the father and older villagers in Kenya give the name to the child?

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If you had caught the bus, you _____ late for work.

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John said he ............... her since they ............... school.

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The print media includes newspapers, magazines, brochures, newsletters, books and even leaflets and pamphlets. Visual media like photography can also be mentioned under this sub-head, since photography is an important mass media, which communicates via visual representations. Although it is said that the electronic or new media have replaced the print media, there exists a majority of audiences who prefer the print media for various communication purposes. Public speaking and event organizing can also be considered as a form of mass media. For many people, it is impossible to imagine a life without their television sets, be it the daily news dose or even the soap operas. This mass media includes television and radio. This category also included electronic media like movies, CDs and DVDs as well as the new hottest electronic gadgets.  With the advent of new technologies like Internet, we are now enjoying the benefits of high technology mass media, which is not only faster than the old-school mass media, but also has a widespread range. Mobile phones, computers and Internet are often referred to as the new-age media. Internet has opened up several new opportunities for mass communication which include email, websites, blogging, Internet television and many other mass media which are booming today. Mass media was developed as a means of social responsibility at the beginning. However, in the course of time, they have attained the status of an industry. Besides the social and industrial nature of mass media, the following common points may also be mentioned. Specifically, it is highly impersonal, because the masses are not identifiable based on perfectly defined audio, visual or written messages. In addition, it is never likely to reach 100 percent of the target nor to have more than 10 percent effectiveness in most of the cases. Contents are generally based on the broad social issues and aspiration of the target audience which may be designed to achieve some specific goals; and all in all, modern mass media draw heavily on technology  
1. What types of media is photography now considered belonging to?

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Sophia is a humanoid robot developed by Hong Kong-based company Hanson Robotics. She has been designed to learn and adapt to human behavior and work with humans, and has been interviewed around the world. In October 2017, she became a Saudi Arabian citizen, the first robot to receive citizenship of a country. According to herself, Sophia was activated on April 19, 2015. She is modeled after actress Audrey Hepbum,and is known for her human-like appearance and behavior compared to previous robotic variants. According to manufacturer, David Hanson, Sophia has artificial intelligence, visual data processing and facial recognition. Sophia also imitates human gestures and facial expressions and is able to answer certain questions and to make simple conversations on predefined topics (e.g. on the weather). The robot uses voice recognition technology from Alphabet Inc. (parent company of Google) and is designed to get smarter over time. Sophia’s intelligence software is designed by SingularityNET. The AI program analyses conversations and extracts data that allows her to improve responses in the future. It is conceptually similar to the computer program ELIZA, which was one of the first attempts at simulating a human conversation. Hanson designed Sophia to be a suitable companion for the elderly at nursing homes, or to help crowds at large events or parks. He hopes that she can ultimately interact with other humans sufficiently to gain social skills. Sophia has been interviewed in the same manner as a human, striking up conversations with hosts. Some replies have been nonsensical, while others have been impressive, such as lengthy discussions with Charlie Rose on 60 Minutes. In a piece for CNBC, when the interviewer expressed concerns about robot behavior, Sophia joked that he had “been reading too much Elon Musk, and watching too many Hollywood movies”. Musk tweeted that Sophia could watch The Godfather and suggested “What’s the worst that could happen?”. On October 11, 2017, Sophia was introduced to the United Nations with a brief conversation with the United Nations Deputy Secretary-General, Amina J. Mohammed. On October 25, at the Future Investment Summit in Riyadh, she was granted Saudi Arabian citizenship, becoming the first robot ever to have a nationality. This attracted controversy as some commentators wondered if this implied that Sophia could vote or marry, or whether a deliberate system shutdown could be considered murder. Social media users used Sophia’s citizenship to criticize Saudi Arabia’s human rights record. 
3. Which of the following statements is NOT true about Sophia according to the passage?

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
In the United States, it is important to be on time, or punctual, for an appointment, a class, a meeting, etc... This may not be true in some other countries, however. An American professor discovered this difference while teaching a class in a Brazilian university. The two-hour class was scheduled to begin at 10 a.m, and end at 12 a.m. On the first day, when the professor arrived on time, no one was in the classroom. Many students came after 11 a.m. Although all of the students greeted the professor as they arrived, few apologised for their lateness. Were these students being rude? He decided to study the students’ behavior.
In American university, students are expected to arrive at the appointed hour. On the other hand, in Brazil, neither the teacher nor the students always arrive at the appointed hour. Classes not only begin at the scheduled time in the United States, but they also end at the scheduled time. In the Brazilian class, only a few students left the class at noon, many remained past 12:30 to discuss the class and ask more questions. While arriving late may not be important in Brazil, neither is staying late.
The explanation for these differences is complicated. People from Brazilian and North American cultures have different feelings about lateness. In Brazil, the students believe that a person who usually arrives late is probably more successful than a person who is always on time. In fact, Brazilians expect a person with status or prestige to arrive late, while in the United States, lateness is usually considered to be disrespectful and unacceptable. Consequently, if a Brazilian is late for an appointment with a North America, the American may misinterpret the reason for the lateness and become angry.
As a result for his study, the professor learned that the Brazilian students were not being disrespectful to him. Instead, they were simply behaving the appropriate way for a Brazilian student in Brazil. Eventually, the professor was able to adapt his own behavior to feel comfortable in the new culture.

It can be inferred from the passage that     .

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As communities across the U.S. replace forests and woodlands with housing developments and other new construction, researchers are noting an increase in Lyme disease. To help prevent the spread of Lyme disease, Dr. Ivan Castro-Arellano, a disease ecologist and wildlife researcher at Texas State University, is exploring how urbanization and its effects on mammals impact the spread of pathogens.  Lyme disease, which spreads from animals to humans, is one of the fastest growing zoonotic diseases in the United States. Counties considered high-risk for Lyme disease grew 300% between 1993 and 2012. Caught quickly, Lyme disease is easily treated with antibiotics, but if it goes untreated it can lead to chronic issues such as Lyme arthritis, facial palsy and impaired memory. Many such zoonotic diseases have been increasing globally, researchers say, partially because of the displacement of animals. While medium- and large-sized mammals are displaced or eradicated by the removal of forested areas, whitefooted mice and deer thrive in small patches of green space. Mice and deer are contributing to favorable conditions for an increase in the ticks that spread the pathogens causing Lyme disease. Although East Texas has a similar pattern of woodland space compared to new construction as the northeast United States, Texas contract the disease at lower rates. This fact piqued the interest of Castro-Arellano. In addition to studying the area where the disease is prevalent, he decided to study where the disease is not prevalent to find keys to prevention. Castro-Arellano is part of a team of biologists, veterinarians and biomedical researchers that have been collecting samples and trying to understand what makes East Texas different. He believes that the climate, or certain species of East Texas mammals who kill ticks, could be contributing to the reduced tick population in East Texas.
2. The word “its” in paragraph 1 refers to _______

Biofuels and the Environment

Leading investors have joined the growing chorus of concern about governments and companies rushing into producing biofuels as a solution for global warming, saying that many involved in the sector could be jeopardizing future profits if they do not consider the long-term impact of what they are doing carefully.

It is essential to build sustainability criteria into the supply chain of any green fuel project in order to ensure that there is no adverse effect on the surrounding environment and social structures. The report produced by the investors expresses concern that many companies may not be fully aware of the potential pitfalls in the biofuel sector.

Production of corn and soya beans has increased dramatically in the last years as an eco-friendly alternative to fossil fuels but environmental and human rights campaigners are worried that this will lead to destruction of rain forests. Food prices could also go up as there is increased competition for crops as both foodstuffs and sources of fuel. Last week, the UN warned that biofuels could have dangerous side effects and said that steps need to be taken to make sure that land converted to grow biofuels does not damage the environment or cause civil unrest. There is already great concern about palm oil, which is used in many foods in addition to being an important biofuel, as rain forests are being cleared in some countries and people driven from their homes to create palm oil plantations.

An analyst and author of the investors' report say that biofuels are not a cure for climate change but they can play their part as long as governments and companies manage the social and environmental impacts thoroughly. There should also be greater measures taken to increase efficiency and to reduce demand.

____ are worried about the boom in biofuels.

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Sandwiches make a delicious snack any time. They are a common sight a picnics and  teas. Interestingly enough, the sandwich is (1) _______ invention of an 18th -century English Earl called John Montagu. Montagu was addicted to card games. He would play these games with his friends for long stretches of time. Often, he even found it too (2) _______ to stop his games for meals.  One day, in the middle of a game, Montagu was served a meal of sliced meat with bread. At the time, Montagu was playing the game that (3) _______ its players to cover cards one on top of another. As Montagu looked at both the game and his food, an idea came to his mind. “I can do the same with my food as well,” he thought. He took a slice of bread, placed a (4)______ of meat on it and covered that with another slice of bread. Montagu was very pleased with his invention because it allowed him to play cards with one hand and eat his meal with the other.  Montagu’s friends quickly (5) _______ to his idea and they named the new invention after him. As Montagu’s full title was “the Earl of Sandwich”, the new invention became known as a “sandwich”.

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It’s extremely important for kids of middle childhood to continue, or to start to lead a healthy lifestyle, including eating nutritious meals as well as getting plenty of exercise and adequate sleep every day. These positive health habits will help children grow strong, stay healthy, and decrease the likelihood that they will become obese. Childhood obesity rates have increasing dramatically in recent years. According to the Centers for Disease Control, in 2004, 18.8% of school-aged children were obese, versus 4% of children 30 years before in 1974. Children’s skyrocketing rate of obesity is worrisome because it greatly increases children’s risk for remaining obese in adulthood, which in turn raises their risk for heart disease, stroke, cancer, diabetes, and premature death as adults. Obese children may also develop associated health problems during the middle childhood stage, such as high blood pressure, high cholesterol levels, and respiratory problems. Obesity can also set the stage for problems with self esteem, depression, anxiety and social ostracism, and/or being victimized by bullies Healthy diet and adequate exercise are important in preventing Type II diabetes in childhood as well as obesity. Diabetes is a metabolic disease in which the body cannot properly metabolize the sugars from food. Because the body cannot metabolize sugars, the sugars accumulate in the bloodstream instead and ultimately stress children’s kidneys, heart, circulatory system, and eyes. Insulin, which is created in the pancreas, is the chemical that breaks down blood sugar. In Type II diabetes, the body does not produce enough insulin to deal with all the sugars coming into the body. This medical diagnosis used to be called “adult-onset diabetes” because the disorder primarily affected adults with poor eating and activity habits. Today, however, this illness is now diagnosed in America’s children far more than in adults. It is now referred to as “Type II diabetes”, to reflect this shift in prevalence. In contrast to the many youth in America who overeat and don’t get enough exercise, other children become obsessed with over-controlling their food intake and with exercising too much. With the constant barrage of perfect, photoshopped bodies in the media today, many children are feeling pressure at younger and younger ages to imitate those images. Children as young as 6 are reporting that they are trying to lose weight by dieting. Overemphasis on extreme thinness can put children at risk for poor self-esteem, unhealthy exercise patterns, and eating disorders such as anorexia and bulimia. Children who embrace healthy eating and exercise habits during middle childhood will have a much easier time maintaining a healthy lifestyle through adolescence and adulthood than individuals who try to make the shift later in life. Teaching children to habitually eat moderate portion sizes and to choose healthy foods in preference to junk foods becomes increasingly important as children begin to spend more time away from home and gain more independence over their food and activity choices. Even though parents have less control over their children’s eating habits during middle childhood than when children were younger, it remains vital that parents continue to reinforce children’s healthy habits whenever possible. 
3. What is author’s main idea in paragraph 2?

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

   Family life in the United States is changing. Thirty or forty years ago, the wife was called a "housewife". She cleaned, cooked, and cared for the children. The husband earned the money for the family. He was usually out working all day. He came home tired in the evening, so he did not do much housework. And he did not see the children very much, except on weekends.

   These days, however, more and more women work outside the home. They cannot stay with the children all day. They, too, come home tired in the evening. They do not want to spend the evening cooking dinner and cleaning up. They do not have time to clean the house and do the laundry. So who is going to do the housework now? Who is going to take care of the children?

   Many families solve the problem of housework by sharing it. In these families, the husband and wife agree to do different jobs around the house, or they take turns doing each job. For example, the husband always cooks dinner and the wife always does the laundry. Or the wife cooks dinner on some nights and the husband cooks dinner on other nights.

   Then there is a question of the children. In the past, many families got help with child care from grandparents. Now families usually do not live near their relatives. The grandparents often are too far away to help in a regular way. More often, parents have to pay for child care help. The help may be a babysister or a day-care center. The problem with this kind of help is the high cost. It is possible only for couples with jobs that pay well.

   Parents may get another kind of help from the companies they work for. Many companies now let people with children work part-time. That way, parents can spend more time with their children. Some husbands may even stop working for a while to stay with the children. For these men there is a new word: They are called "househusband". In the United States more ans more men are becoming househusband every year.

   These changes in the home mean changes in the family. Fathers can learn to understand their children better, and the children can get to know their fathers better. Husbands and wives may also find changes in their marriage. They, too, may have a better understanding of each other.

Nowadays there are ____________.

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OPEC was established at a conference held in Baghdad Sept. 10–14, 1960, and was  formally constituted in January 1961 by five countries: Saudi Arabia, Iran, Iraq, Kuwait, and Venezuela. Members admitted afterward include Qatar (1961), Indonesia and Libya (1962), Abū Ẓabī (1967), Algeria (1969), Nigeria (1971), Ecuador (1973), and Angola (2007). The United Arab Emirates assumed Abū Ẓabī’s membership in the 1970s. Gabon, which had joined in 1975, withdrew in January 1995, but it had relatively insignificant oil reserves. Ecuador suspended its membership from OPEC from December 1992 until October 2007, while Indonesia suspended its membership beginning in January 2009.  OPEC’s headquarters, first located in Geneva, was moved to Vienna in 1965. OPEC members coordinate policies on oil prices, production, and related matters at semiannual and special meetings of the OPEC Conference. The Board of Governors, which is responsible for managing the organization, convening the Conference, and drawing up the annual budget, contains representatives appointed by each member country; its chair is elected to a one-year term by the Conference. OPEC also possesses a Secretariat, headed by a secretary – general appointed by the Conference for a three-year term; the Secretariat includes research and energy-studies divisions.  OPEC members collectively own about two-thirds of the world’s proven petroleum reserves and account for two-fifths of world oil production. Members differ in a variety of ways, including the size of oil reserves, geography, religion, and economic and political interests. Four members – Kuwait, Qatar, Saudi Arabia, and the United Arab Emirates – have very large per capita oil reserves; they also are relatively strong financially and thus have considerable flexibility in adjusting their production. Saudi Arabia, which has the largest reserves and a relatively small (but fast-growing) population, has traditionally played a dominant role in determining overall production and prices Because OPEC has been beset by numerous conflicts throughout its history, some experts have concluded that it is not a cartel – or at least not an effective one – and that it has little, if any, influence over the amount of oil produced or its price. Other experts believe that OPEC is an effective cartel, though it has not been equally effective at all times. The debate largely centers on semantics and the definition of what constitutes a cartel. Those who argue that OPEC is not a cartel emphasize the sovereignty of each member country, the inherent problems of coordinating price and production policies, and the tendency of countries to renege on prior agreements at ministerial meetings. Those who claim that OPEC is a cartel argue that production costs in the Persian Gulf are generally less than 10 percent of the price charged and that prices would decline toward those costs in the absence of coordination by OPEC.  The influence of individual OPEC members on the organization and on the oil market usually depends on their levels of reserves and production. Saudi Arabia, which controls about one-third of OPEC’s total oil reserves, plays a leading role in the organization. Other important members are Iran, Iraq, Kuwait, and the United Arab Emirates, whose combined reserves are significantly greater than those of Saudi Arabia. Kuwait, which has a very small population, has shown a willingness to cut production relative to the size of its reserves, whereas Iran and Iraq, both with large and growing populations, have generally produced at high levels relative to reserves. Revolutions and wars have impaired the ability of some OPEC members to maintain high levels of production. 
2. The word “semiannual” in paragraph 2 mostly means ______

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For 150 years scientists have tried to determine the solar constant, the amount of solar energy that reaches the Earth. Yet, even in the most cloud-free regions of the planet, the solar constant cannot be measured precisely. Gas molecules and dust particles in the atmosphere absorb and scatter sunlight and prevent some wavelengths of the light from ever reaching the ground. With the advent of satellites, however, scientists have finally been able to measure the Sun's output without being impeded by the Earth's atmosphere. Solar Max, a satellite from the National Aeronautics and Space Administration (NASA), has been measuring the Sun's output since February 1980. Although a malfunction in the satellite's control system limited its observation for a few years, the satellite was repaired in orbit by astronauts from the space shuttle in 1984. Max's observations indicate that the solar constant is not really constant after all. The satellite's instruments have detected frequent, small variations in the Sun's energy output, generally amounting to no more than 0.05 percent of the Sun's mean energy output and lasting from a few weeks. Scientists believe these fluctuations coincide with the appearance and disappearance of large groups of sunspots on the Sun's disk. Sunspots are relatively dark regions on the Sun's surface that have strong magnetic fields and a temperature about 2,000 degrees Fahrenheit cooler than the rest of the Sun's surface. Particularly large fluctuations in the solar constant have coincided with sightings of large sunspot group. In 1980, for example, Solar Max's instrument, registered a 0.3percent drop in the solar energy reaching the Earth. At that time a sunspot group covered about 0.6 percent of the solar disk, an area 20 times larger than the Earth's surface. Long-term variations in the solar constant are more difficult to determine. Although Solar Max's data have indicated a slow and steady decline in the Sun's output, some scientists have thought that the satellite's aging detectors might have become less sensitive over the years, thus falsely indicating a drop in the solar constant. This possibility was dismissed, however, by comparing Solar Max's observations with data from a similar instrument operating on NASA's Nimbus 7 weather satellite since 1978.
3. Why is it not possible to measure the solar constant accurately without a satellite?

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The climate crisis is poised to deliver a severe blow to America’s most threatened animals, with a new study finding that almost every species considered endangered is vulnerable in some way to global heating. Of the 459 animal species listed as endangered by the US government, researchers found that all but one, or 99.8%, have characteristics that will make it difficult for them to adapt to rising temperatures. The California condor, once close to being completely wiped out, faces increased risk of contamination in hotter conditions. Key deer, found only in the Florida Keys, face losing habitat to the rising seas. Whole classes of animals including amphibians, mollusks and arthropods are sensitive to the greatest number of climate-related threats, such as changes in water quality, shifting seasons and harmful invasive species that move in as temperatures climb. Mammals, such as the north Atlantic right whale and Florida panther, also face increased hardships, albeit on fewer fronts than amphibians, mollusks and arthropods.  Despite the overwhelming peril faced by America’s endangered species due to the climate crisis, the report, published in Nature Climate Change, found a patchy response from the US government. Federal agencies consider just 64% of endangered species to be threatened by the climate crisis, while just 18% of listed species have protection plans in place. Astrid Caldas, a study co-author and a climate scientist at the Union of Concerned Scientists said: “While agencies have increasingly listed climate change as a growing threat to species whose survival is already precarious, many have not translated this concern into tangible actions, meaning a significant protection gap still exists.” Nearly half of Australian species are threatened by the climate crisis, researchers have found. A spokesman for the US Fish and Wildlife Service, which oversees the endangered species list, said that while a species may be sensitive to changes in the climate, this sensitivity may not be so severe as to warrant being put on the list. “Our process for determining this looks at five factors: threats to a species’ habitat, overutilization, disease or predation, existing regulatory mechanisms, and other factors that may affect its continued existence,” he said. “Through this scientifically rigorous process we examine and account for the effects of climate change.  
7. Which of the following statements is TRUE, according to the passage?

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The elusive “generation gap” is construed as being widest when one of the two  generations is the adolescent. While the gap exists in almost all facets of social and personal domains, never is it more evident than in the field of technology, where one of the generations is a digital native and the other, an immigrant or even an alien, depending upon the stage of the continuum of adulthood. The use of gadgets itself is markedly influenced by age, as shown in Pew Research Center’s Internet & American Life Project that studied how different generations use technology.  Although cell phones are now the predominant form of interpersonal communication, the way they are used significantly varies between generations. Youngsters use their phones for a variety of activities such as taking photos, texting, going online, instant messaging, emailing, playing games, listening to music, and even recording and watching videos while adults progressively according to their age progression, restrict the use of these devices to fewer and fewer activities. Interestingly, Pew Research found that the one cell phone activity that transcends age is taking photos, with adults just as likely to click photos on the cell phone cameras as the young. However, the type of photos taken differs, with adolescents clicking more selfies that adults.  The Internet seems to be a good leveler of digital use, at least within the US. While fewer than 60% of senior citizens (ages >65) are conversant with and use the Internet in 2014, the percentages are comparable for all other age groups; 92% for teens, 97% for young adults (18-29 years), 94% for the mid-lifers (30-49%) and 88% for older adults (50-64%). How the internet is used also varies among age groups. While teenagers and young adults under age 30 use the Internet to find information, socialize, play, shop and perhaps conduct business, older users visit government websites or seek financial information online. However, this gap is narrowing, according to Pew Research, and activities such as emails and search engines being increasingly used by all age groups that are online.  Social media is another area where there is an age difference. While the percentage of adults who use social media (72%) is not that different from the youngsters in it (81%), there is a difference in the type of social media applications that is favored. Youngsters (teens and young adults) seem more prevalent in social media applications such as Facebook and Twitter while adults dominate tumblr, Instagram and Pinterest. Adults are largely passive or semi-active users of social media as seen in that adults typically add contacts only on request while adolescents actively seek new friendships. Adolescents use the social media platform as a conversation space and an outlet for self-expression, aimed largely at building new relationships while adults use social media to maintaining existing relationships. Adults have fewer contacts with a third of the adults in social media admitting to having family as their main contact group. Contrast this with the fact that only 10 and 15 percent of adolescents reported to have family in their social media contact list.
4. The word “conversant” in paragraph 3 is closest in meaning to ____________

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
In the course of its history, human inventions have dramatically increased the average amount of energy available for use per person. Primitive peoples in cold regions burned wood and animal dung to heat their caves, cook food, and drive off animals by fire. The first step toward the developing of more efficient fuels was taken when people discovered that they could use vegetable oils and animal fats in lieu of gathered or cut wood. Charcoal gave off more intensive heat than wood and was more easily obtainable than organic fats. The Greeks first began to use coal for metal smelting in the 4th century, but it did not come into extensive use until the Industrial Revolution.
In the 1700s, at the beginning of the Industrial Revolution, most energy used in the United States and other nations undergoing industrialization was obtained from perpetual and renewable sources, such as wood, water streams, domesticated animal labor, and wind. These were predominantly locally available supplies. By mid-1800s, 91 percent of all commercial energy consumed in the United States and European countries was obtained from wood. However, at he beginning of the 20th century, coal became a major energy source and replaced wood in industrializing countries. Although in most regions and climate zones wood was more readily accessible than coal, the latter represents a more concentrated source of energy. In 1910, natural gas and oil firmly replaced coal as the main source of fuel because they are lighter and, therefore, cheaper to transport. They burned more cleanly than coal and polluted less. Unlike coal, oil could be refined to manufacture liquid fuels for vehicles, a very important consideration in the early 1900s, when the automobile arrived on the scene.
By 1984, non-renewable fossil fuels, such as oil, coal, and natural gas, provided over 82 percent of the commercial and industrial energy used in the world. Small amounts of energy were derived from nuclear fission, and the remaining 16 percent came from burning direct perpetual and renewable fuels, such as biomass. Between 1700 and 1986, a large number of countries shifted from the use of energy from local sources to a centralized generation of hydropower and solar energy converted to electricity. The energy derived from non-renewable fossil fuels has been increasingly produced in one location and transported to another, as is the case with most automobile fuels. In countries with private, rather than public transportation, the age of non-renewable fuels has created a dependency on a finite resource that will have to be replaced.
Alternative fuel sources are numerous, and shale oil and hydrocarbons are just two examples. The extraction of shale oil from large deposits in Asian and European regions has proven to be labor consuming and costly. The resulting product is sulfur-and nitrogen-rich, and large scale extractions are presently prohibitive. Similarly, the extraction of hydrocarbons from tar sands in Alberta and Utah is complex. Semi-solid hydrocarbons cannot be easily separated from the sandstone and limestone that carry them, and modern technology is not sufficiently versatile for a large-scale removal of the material. However, both sources of fuel may eventually be needed as petroleum prices continue to rise and limitations in fossil fuel availability make alternative deposits more attractive.

It can be inferred from the passage that in the early 20th centurgy, energy was obtained primarily from

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
Thanks to electricity, candles are no longer a necessity in our lives, but they are still a pleasure. The warm flame of candlelight can quickly alter the mood and atmosphere of a room, often creating a  peaceful scene that electric light just cannot match.
Candles are an important part of many cultural and religious festival and have been burnt in various forms for centuries. The ancient Romans and Egyptians made candles from a type of fiber coated with wax. However, up until the nineteenth century, most candles were made from a substance called tallow, obtained from beef fat. Tallow candles were very smoky and, understandably, had an unpleasant odor.
In the 19th century, candle makers learned to separate stearin, the solid form fat used as a type of glue, from tallow and used it to harden other fats. Candles that contained stearin would burn longer than previous ones and had a better smell. Stearin is still one of the main components of modern candle- making, and the techniques used to create candles today are much the same as they have been for many years. These days, the increase range of wax dyes, perfumes and other additives that are now available make candle making a very exciting and rewarding hobby.
Sales of candles have increased greatly over the last few years, showing that they have become part of our lives again, not through necessity, but because of the magical atmosphere they create. In our increasingly stressful lives, the calming quality of candlelight has a relaxing effect that many enjoy.
For those would like to learn to make candles, finding and buying candle-making kits is easy. Candle- making is definitely enhanced by the exciting possibilities of experimentation with various materials. Be brave and try out different effects – some of the most wonderful creations can happen by accident. With a bit of practice, you will be amazed at the very professional finish that can be achieved.
Despite their delicate beauty, candles can, of course, be highly dangerous. One should never leave lit candles unattended, even for a few moments. Always make sure candles are securely placed within candleholders.
Teach your children to respect a burning candle, and of course keep burning candles away from flammable materials. Keep your home safe by remembering that a candle is magical, but fire can be very destructive. Be careful, and enjoy the beauty of your candles!

Which of the following best expresses the main idea of this passage?