Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

 Reading is a great chance for learners to discuss about what books are talking about.

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The dramatic growth of the world's population in the twentieth century was on a scale without parallel in human history. Most of this growth had occurred since 1950 and was known as the population 'explosion'. Between 1950 and 1980 the world population increased from 2.5 to over 4 billion, and by the end of the twenty century the figure had risen to about 6.6 billion. Growth of this size cannot continue indefinitely. Recent forecasts suggest that the total population will level out at between 10 and 15 billion in the mid twenty first century. Already there are encouraging signs that the rate of increase in many less developed countries is beginning to slow down.

The phrasal verb 'level out' in line 8 means ______.

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During droughts water is scarce but is it possible to make it rain to provide water. Experiments in cloud seeding suggest that it may be possible to artificially create rainfall. Rainfall occurs when supercooled droplets of water – those that are still liquid but are at a temperature below the usual freezing point of zero centigrade – form ice crystals. Now too heavy to remain suspended in the air, these then fall, often melting on their way down to form rain. Even in dry areas the air usually contains some water. This can be made to come together and form ice crystals by seeding the atmosphere with chemicals such as silver iodide or dry ice. They work to promote rainfall by inducing nucleation – what little water is in the air condenses around the newly introduced particles and crystallises to form ice. The ‘seeds’ can be delivered by plane or simply by spraying from the ground. But does it work? It’s hard to tell for sure. As is often the case with weather and climate, it’s impossible to carry out a controlled experiment – so, in areas of increased precipitation, we can’t know whether it would still have rained even if the clouds hadn’t been seeded. Success has been claimed for trials in Australia, France, Spain and the US. In the United Arab Emirates, the technique is credited with the creation of 52 storms in the Abu Dhabi desert, while China boasts of having used the technology in reverse to keep the Beijing Olympic Games of 2008 dry. Recent research, however, suggests that it’s not as effective as was previously believed  
5. The word “credited” in paragraph 5 is closest in meaning to ______

It used to be that people would drink coffee or tea in the morning to pick them up and get them going for the day. Then cola drinks hit the market. With lots of caffeine and sugar, these beverages soon became the pick-me-up of choice for many adults and teenagers. Now drink companies are putting out so-called "energy drinks." These beverages have the specific aim of giving tired consumers more energy.

One example of a popular energy drink is Red Bull. The company that puts out this beverage has stated in interviews that Red Bull is not a thirst quencher. Nor is it meant to be a fluid replacement drink for athletes. Instead, the beverage is meant to revitalize a tired consumer's body and mind. In order to do this, the makers of Red Bull, and other energy drinks, typically add vitamins and certain chemicals to their beverages. The added chemicals are like chemicals that the body naturally produces for energy. The vitamins, chemicals, caffeine, and sugar found in these beverages all seem like a sure bet to give a person energy.

Health professionals are not so sure, though. For one thing, there is not enough evidence to show that all of the vitamins added to energy drinks actually raise a person's energy level. Another problem is that there are so many things in the beverages. Nobody knows for sure how all of the ingredients in energy drinks work together.

Dr. Brent Bauer, one of the directors at the Mayo Clinic in the US, cautions people about believing all the claims energy drinks make. He says, —It is plausible if you put all these things together, you  will get a good result. || However, Dr. Bauer adds the mix of ingredients could also have a negative impact on the body. —We just don't know at this point,|| he says.

(Source: —Reading Challenge 2||, Casey Malarcher & Andrea Janzen, Compass Publishing)

The beverages mentioned in the first paragraph aim to give consumers________.

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The national teachers union and an activist group have welcomed Human Resources  Minister M Kula Segaran’s announcement that schools will be supplied with a list of endangered jobs, saying it will be a useful aid in career guidance. Kula said on Wednesday that the list would help pupils decide what courses to avoid in pursuing further studies. Kula spoke of the looming fourth industrial revolution, saying it could result in the irrelevance of 30% of existing jobs. Harry Tan, the secretary-general of the National Union of the Teaching Profession, said the list would be a good additional tool for schools in their work to prepare students for the job market, and Parent Action Group for Education chairman Noor Azimah Rahim said its use could result in an easing of the problem of youth unemployment.  Tan told FMT he hoped the education and human resources ministries would also consult the private sector since they were familiar with market forces. He said teachers would always try to help students pursue their dreams, but he added that schools were facing what he called “logistical issues” that could prevent them from effectively preparing students for future jobs. One of these problems, he said, was a shortage of English teachers and another was a lack of computer numerical control machines in vocational colleges.  Azimah warned against using the list as more than just a guide, saying the job market would keep changing with the times. What would remain a constant, she said, was the need for students to be bilingual, to master the foundations of mathematics and science and to balance these with involvement in sports and the arts. She urged teachers to promote creative thinking and problem solving skills among their students, saying these were sought after by employers. 
2. According to paragraph 1, what is the possible result of the 4th industrial revolution?

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The aviation industry, especially the commercial aviation sector, is constantly striving to improve both the way it works and its customer satisfaction. It has begun using artificial intelligence. Though AI in the aviation industry is still in the nascent stage, some progress has been made already as certain leading carriers invest in AI. To make a long story short, AI can redefine how the aviation industry goes about its work. In 2017, American Airlines conducted an app development competition with the goal of having an app developed for making baggage screening easier for passengers. The competition, named HackWars, was themed upon artificial intelligence, drones and augmented and virtual reality. The winner, known as “Team Avatar,” developed an app that would not only allow passengers determine their baggage size before arriving at the airport, but also prepay any potential baggage-related expenses. United Airlines is using Amazon’s Alexa to have certain common customer queries answered. In September 2017, United announced a collaboration with Alexa. The feature is known as the United skill. To get started, all passengers need to do is to  add the United skill to their Alexa app and then start asking questions. Alexa answers common queries correctly, such as the status of a flight by number, check-in requests and availability of Wi-Fi on a flight. The reviews so far have been mixed, which points to the fact that there is a learning curve, and it is still a long way to go before AI can fully handle customer assistance. Tracking progress is an enormous challenge that airlines will face. The first thing they need to do is to develop analytics that will help them develop and process accurate data. However, that in itself is a challenge. What kind of analytics will help? For example, customer satisfaction is going to be one of the most important factors in success. What kind of analytics will determine that airlines have been improving on customer satisfaction parameters? AI needs huge investments, and probably the biggest risk in this is smaller, especially budget airlines are going to miss out on reaping the benefits of AI fully. Does that mean that the performance of the smaller carriers will be impacted? That might not be the case, because we might be moving toward more acquisitions and mergers. Bigger airlines will have a massive appetite for acquiring smaller airlines with an eye on the market. It is not all gloom and doom though, because smaller airlines like Southwest have already shown some initiatives toward embracing AI. It is surprising that a sector as important as aviation has woken up to AI so late. As AI in aviation picks up its pace, there could probably be a few mergers, acquisitions or even closure of small airlines which will not be able to afford the investments. Now, AI seems the best option to take aviation to the next level.
4. The word “queries” in paragraph 3 can best be replaced by _____

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Automated manufacture arose out of the intimate relationship of such economic forces and technical innovations as the division of labor, power transfer and the mechanization of the factory, and the development of transfer machines and feedback systems as explained below. The division of labor (that is, the reduction of a manufacturing or service process into its smallest independent steps) developed in the latter half of the 18th century and was first discussed by the Scottish economist Adam Smith in his book An Inquiry into the Nature and Causes of the Wealth of Nations (1776). In manufacturing, the division of labor results in increased production and a reduction in the level of skills required of workers. Mechanization was the next step necessary in the development of automation. The simplification of work made possible by the division of labor also made it possible to design and build machines that duplicated the motions of the worker. As the technology of power transfer evolved, these specialized machines were motorized and their production efficiency was improved. The development of power technology also gave rise to the factory system of production, because all workers and machines had to be located near the power source. The transfer machine is a device used to move a workpiece from one specialized machine tool to another, in such a manner as to properly position the workpiece for the next machining operation. Industrial robots, originally designed only to perform simple tasks in environments dangerous to human workers, are now extremely dexterous and are being used to transfer, handle, and index (that is, to position) both light and heavy workpieces, thus performing all the functions of a transfer machine. In actual practice, a number of separate machines are integrated into what may be thought of as one large machine. In the 1920s the auto industry combined these concepts into an integrated system of production. The goal of this assembly-line system was to make automobiles available to people who previously could not afford them. This method of production was adopted by most automobile manufacturers and rapidly became known as Detroit automation. Despite more recent advances, it is this system of production that most people think of as automation.
5. The auto industry is mentioned in the passage as ____

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For many years, scientists have speculated that the cataclysmic impact of an asteroid with the earth was responsible for the demise of the dinosaurs approximately 65 million years ago. Previous discoveries and results have hinted that an asteroid two kilometers in diameter struck the Yucatan peninsula in Eastern Mexico. This impact, stronger than one thousand nuclear explosions, is speculated to have cast a cloud of dust and debris into the atmosphere, covering the entire surface of the earth and blocking out the sun and consequently lowering the surface temperature of the earth. With such a radical change in the earth's environment, scientists believe that over 99% of all animal and plant species were eradicated. Only after millions of years did plants and animals even begin to recover and develop into forms that were better adapted to survive changes in their environment. But, the reign of the dinosaurs had ended and the age of mammals had begun. The crucial link that has held this theory together has been the element iridium. Iridium is not commonly found on either the surface of the earth or inside the crust. It is more commonly found in asteroids or meteorites throughout the solar system. Scientists have hypothesized that after the asteroid impacted the Earth, an even layer of iridium sediment settled over the globe and eventually became part of its surface. The theory, of course, has depended on the discovery of such an existing layer of iridium. Unfortunately, scientists have never been able to offer absolute proof that this asteroid impact ever occurred. Recently, however, a discovery may go a long way toward validating these scientists 'theories. In 1996, a team of marine biologists excavated samples of rock from the Atlantic Ocean just off the cost of Bermuda. Found thousands of meters below the sea, these samples contain iridium similar to those found in the Yucatan peninsula thousands of kilometers away. At first, scientists were skeptical whether the samples were from the same time period. But since carbon dating placed them to 65 million years ago, their doubts were quickly alleviated. Since then many of the other theories for the demise of the dinosaur have been finally laid to rest.
1. This passage mainly discusses a theory about: 

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For centuries, historians and archaeologists have puzzled over the many mysteries of  Stonehenge, the prehistoric monument that took Neolithic builders an estimated 1,500 years to erect. Its construction is so baffling because, scientists have traced the bluestones that make up its inner ring all the way to the Preseli Hills in Wales, some 200 miles from where Stonehenge sits on Salisbury Plain.  If the facts surrounding the architects and construction of Stonehenge remain shadowy at best, the purpose of the arresting monument is even more of a mystery. While historians agree that it was a place of great importance for over 1,000 years, we may never know what drew early Britons to Salisbury Plain and inspired them to continue developing it. There is strong archaeological evidence that Stonehenge was used as a burial site, at least for part of its long history, but most scholars believe it served other functions as well-either as a ceremonial site, a religious pilgrimage destination, a final resting place for royalty or a memorial erected to honor and perhaps spiritually connect with distant ancestors.  In the 1960s, the astronomer Gerald Hawkins suggested that the cluster of megalithic stones operated as an astronomical calendar, with different points corresponding to astrological phenomena such as solstices, equinoxes and eclipses. While his theory has received quite a bit of attention over the years, critics maintain that Stonehenge’s builders probably lacked the knowledge necessary to predict such events or that England’s dense cloud cover would have obscured their view of the skies. More recently, signs of illness and injury in the human remains unearthed at Stonehenge led a group of British archaeologists to speculate that it was considered a place of healing, perhaps because bluestones were thought to have curative powers.
3. According to paragraph 2, what is NOT mentioned as the Stonehenge’s theorised reason for being?

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When you first arrive in a foreign culture, often your first reaction is completely positive. Everything seems exciting, different and fascinating. It’s an (1) ______. If you are just on a short holiday, you will probably never leave this phase. (2) ______, if you stay longer, your attitude can start to change. As you start to realize (3) ______ little you really understand the new culture, life can get frustrating. People misunderstand what you are trying to say, or they may laugh at you when you say something incorrectly. Even simple things, like posting a letter, can seem very difficult to you. Thus, you are likely to get angry or upset when things go wrong. With time, though, you start to (4) ______ to become more comfortable with the differences and better able to handle frustrating situations. Your (5) ______ of humor reappears. Finally, you may feel enthusiastic about the culture once again, enjoy living in it, and even prefer certain aspects of the culture to your own.

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The teacher said Columbus ............... America in 1942.

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Which ____________ is the documentary on?

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As cases of coronavirus infection proliferate around the world and governments take extraordinary measures to limit the spread, there is still a lot of confusion about what exactly the virus does to people’s bodies. The symptoms — fever, cough, shortness of breath — can signal any number of illnesses, from flu to strep to the common cold. The virus is spread through droplets transmitted into the air from coughing or sneezing, which people nearby can take in through their nose, mouth or eyes. The viral particles in these droplets travel quickly to the back of your nasal passages and to the mucous membranes in the back of your throat, attaching to a particular receptor in cells, beginning there. Coronavirus particles have spiked proteins sticking out from their surfaces, and these spikes hook onto cell membranes, allowing the virus’s genetic material to enter the human cell. That genetic material proceeds to “hijack the metabolism of the cell and say, in effect, ‘Don’t do your usual job. Your job now is to help me multiply and make the virus,’” said Dr. William Schaffner. As copies of the virus multiply, they burst out and infect neighboring cells. The virus then “crawls progressively down the bronchial tubes,” Dr. Schaffner said. When the virus reaches the lungs, their mucous membranes become inflamed. That can damage the alveoli or lung sacs and they have to work harder to carry out their function of supplying oxygen to the blood that circulates throughout our body and removing carbon dioxide from the blood so that it can be exhaled. The swelling and the impaired flow of oxygen can cause those areas in the lungs to fill with fluid, pus and dead cells. Pneumonia, an infection in the lung, can occur  
1. What is the topic of the passage?

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Many people believe the glare from snow causes snow-blindness. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness, when exposed to several hours of “snow light”. The United States Army has now determined that the glare from snow does not cause snow-blindness in troops in a snow-covered country. Rather, a man’s eyes frequently find nothing to focus on in a broad expanse of a snow-covered area. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snow-blindness. Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even the scouts themselves throw lightweight, dark-colored objects ahead on which they too can focus. The men following can then see something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow-blind or lost: In this way the problem of crossing a solid white area is overcome
2. The eyeballs become sore and the eye muscles ache because __________ 

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Gustave Eiffel was well-known for ____________ Eiffel tower.

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In addition to exploring the caves and grottos, and seeing its flora and fauna, visitors can also enjoy mountain climbing.

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There’s a direct link between employee satisfaction and customer satisfaction.  Employees are the driving factor behind customer satisfaction. Employee interactions set the tone for a positive or negative customer experience. When employees aren’t happy at work, their interactions with customers can, and almost always will, suffer. Over the course of time, this can have serious repercussions for a business. The place where this becomes the most critical is any business where employees are directly interacting with customers, such as retail or food service. Historically underpaid and overworked, employees in these jobs are tasked with spending their entire shifts serving customers.  This is where employee experience comes in. If even a fraction of a customer experience budget was spent on employee experience, there would be a huge return on investment. One of the easiest ways to enhance employee experience is to ask for and welcome employees’ feedback. They have great insight into customer needs. After all, they’re the ones who are directly interacting with customers and hearing their criticisms and compliments firsthand. Employees can be your biggest asset when it comes to customer satisfaction.  A large part of employee experience revolves around understanding what employees need and want and gaining insight into their work preferences. Another critical piece of the employee experience is training and development. Employees should be equipped with the skills they need to excel at their jobs and have opportunities to continue to learn and develop. They should be able to check in and touch base with their managers to keep track of their progress and discuss any questions or concerns as they arise. Showing employees that you value the work they’re doing is one of the easiest ways to boost their motivation. It can be as simple as saying thank you, to publicly acknowledging and celebrating their contributions. It’s not just the younger generations who crave recognition - no one likes to feel like the work they’re doing is going unnoticed.  It’s time to shift the mindset from employees working just to work, to acknowledging that they’re valuable contributors to a company’s success. Employees need to understand how important their role is and how their work fits into the bigger picture. They need to feel like their voices are being heard and they have respect from their managers. Most importantly, they need to be able to come to work and know that the next eight hours won’t be pure torture. 
8. Which of the following can be inferred from the passage?

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Desertification is creating additional challenges to the survival of endangered animal species in India, according to a senior wildlife official who attended the 14th Conference of Parties (COP14) to the United Nations Convention to Combat Desertification (UNCCD) in New Delhi. A few days earlier, at COP14 in New Delhi, Dr Chandra had said that the statistics on species extinction have been derived from a database of more than 5.6 million specimens, which have lived across India and the neighbouring countries since before independence. The deteriorating pattern in the species’ distribution in geo-special platforms over the past 100 years clearly highlights the concerning impact of deforestation and desertification. Land degradation threatens species like the Great Indian Bustard, which is classified as “critically endangered” by the International Union for Conservation of Nature (IUCN). The Weather Channel India got in touch with Dr Chandra, who said that less than 150 Great Indian Bustards are alive today. “Desertification and land degradation are among the 20-30 risk factors to the survival of Great Indian Bustards,” Dr Chandra told Weather.com. In simple terms, desertification is a process wherein fertile land becomes unusable, typically as a result of a long drought, deforestation, salinisation, intensive agricultural practices, and the excessive usage of insecticides, pesticides and chemicals. Desertification leads to hazardous effects on not just animals, but also on the food chain and the overall biodiversity—right from microscopic organisms to human beings. Deforestation has affected over 30% of the land in India due to over-cultivation, soil erosion and depletion of wetlands. Along with India, the planet as a whole currently stares at the fast-growing threat of land degradation  
1. The passage mainly discuss_______

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.

The author of the passage implies that in the 1700s, sources of energy were

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From their inception, most rural neighborhoods in colonial North America included at least one carpenter, joiner, sawyer, and cooper in woodworking; a weaver and a tailor for clothing production; a tanner, currier, and cordwainer (shoemaker) for fabricating leather objects; and a blacksmith for metalwork. Where stone was the local building material, a mason was sure to appear on the list of people who paid taxes. With only an apprentice as an assistant, the rural artisan provided the neighborhood with common goods from furniture to shoes to farm equipment in exchange for cash or for “goods in kind” from the customer’s field, pasture, or dairy. Sometimes artisans transformed material provided by the customer wove cloth of yam spun at the farm from the wool of the family sheep; made chairs or tables from wood cut in the customer’s own woodlot; produced shoes or leather breeches from cow, deer, or sheepskin tanned on the farm.  Like their farming neighbors, rural artisans were part of an economy seen, by one historian, as “an orchestra conducted by nature.” Some tasks could not be done in the winter, others had to be put off during harvest time, and still others waited on raw materials that were only produced seasonally. As the days grew shorter, shop hours kept pace, since few artisans could afford enough artificial light to continue work when the sun went down.  To the best of their ability, colonial artisans tried to keep their shops as efficient as possible and to regularize their schedules and methods of production for the best return on their investment in time, tools, and materials. While it is pleasant to imagine a woodworker, for example, carefully matching lumber, joining a chest together without resort to nails or glue, and applying all thought and energy to carving beautiful designs on the finished piece, the time required was not justified unless the customer was willing to pay extra for the quality - and few in rural areas were. Artisans, therefore, often found it necessary to employ as many shortcuts and economics as possible while still producing satisfactory products.
3. The word "fabricating" in the passage is closest in meaning to ____

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Most of the viewers imagine that the presenter does little (1)______arrive at the  studio a few minutes before the broadcast, read the weather, and then go home. In fact, this image is far from the truth. The two-minute (2) ____ which we all rely on when we need to know tomorrow’s weather is the result of a hard day’s work by the presenter, who is actually a highly-qualified (3)_______. Every morning, after a weather forecaster arrives at the TV studios, his/her first task of the day is to collect the latest data from the National Meteorological Office. The information is very detailed and includes predictions, satellite and radar pictures, as well as more technical data. After gathering all the relevant material from this office, the forecaster has to (4)________ the scientific terminology and maps into images and words which viewers can easily understand. The final broadcast is then carefully planned. The presenter decides what to say and in what order to say it. Next a “story board” is drawn up which lays out the script word for word. The time allocated for each broadcast can also alter. This is because the weather report is screened after the news, (5)__________ can vary in length. The weather forecaster doesn’t always know how much time is available, which means that he/she has to be thoroughly prepared so that the material can be adapted to the time available