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Sugar tastes sweet because of thousands of receptors on the tongue which connect the substance with the brain. The taste of sweetness is (1) ____ accepted as the most pleasurable known although it is a fructose Abundant is the most common occurring sugar, (2) ____of which include fruit and honey. Sucrose which supplies glucose to the body, is (3) ____ from the sugar cane plant, and white sugar (pure sucrose) is used by food technologists to (4) ____ sweetness in other substances. Approximately a dozen artificial (5) ____ have been discovered; one of the earliest was Sorbitol from France. Manufacturers (6) ____ large amounts of sugar to foodstuffs but never more than the (7) ____ required to produce the optimum pleasurable taste. Surprisingly, this (8) ____ is similar for different people and in different cultures. No one has (9) ____ discovered a way to predict whether a substance will taste sweet, and it was by (10) ____ alone that all the man-made chemical sweeteners were found to be sweet

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All over the world, people are changing the face of the earth. Wild areas are cleared for farming and to build roads and expand cities. Our factories, cars, and power stations poison the ….(1) with polluting gases and chemical waste. As well as transforming the environment, we are destroying habitats, the home of ……(2) plants and animals. Living things have evolved over millions of years. Many animals and plants can only …….(3) in certain environments. When such areas destroyed, wildlife cannot always ……..(4) to the new conditions and some species may …….(5) out. Thousands of species of plants and animals face extinction because of human activities. People can also …….(6) from habitat destruction. When forests are cut down, earth is washed away, this causes crop failures and starvation. There is the future to consider, too; plants provide essential foods and can also be used in medicines. If species ……..(7) extinct, their potential value will never be known. The scale of destruction is enormous. Swamps, forests, grasslands and jungles are being cleared at an increasing extend. Half of the world‘s tropical rainforests have ……..(8) been destroyed. Coral reefs, called the forests of the ocean because they are so rich in life, are……..(9) around the world. We must limit the damage to habitats now………(10) they remain a valuable resource for the future

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No educational medium better serves as a means of spatial communication than the atlas. Atlases deal with such invaluable information as population distribution and density. One of the best, Pennycooke’s World Atlas, has been widely accepted as a standard owing to the quality of its maps and photographs, which not only show various settlements but also portray them in a variety of scales. In fact , the very first map in the atlas is a cleverly designed population cartogram that projects the size of each country if geographical size were proportional to population. Following the proportional layout , a sequence of smaller maps shows the world’s population density, each country’s birth and death rates, population increase and decrease , industrialization, urbanization , gross national product in terms of per capita income, the quality of medical care, literacy, and language. To give readers a perspective on how their own country fits in with the global view, additional projections despite the world’s patterns in nutrition, calorie and protein consumption, health care, number of physicians per unit of population, and life expectancy by region. Population density maps on a subcontinental scale, as well as political maps, convey the diverse demographic phenomena of the world in a broad array of scales.

What is the main topic of this passage ?

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It’s a sound you will probably never hear, a sickened tree sending out a distress signal. But a group of scientists has heard the cries, and they think some insects also hear the trees and are drawn to them like vulture to a dying animal. Researchers with the US Department of Agriculture’s Forest Service fastened sensors to the bark of drought-stricken trees clearly heard distress calls. According to one of the scientists, most parched trees transmit their plight in the 50-hertz to 50-kilohertz range. (The unaided human ear can detect no more than 20 kilohertz). Red oak, maple, white pine, and birch all make slightly different sounds in the form of vibrations at the surface of the wood.
The scientists think that the vibrations are created when the water columns inside tubes that run along the length of the tree break, a result of too little water following through them. These fractured columns send out distinctive vibration pattems. Because some insects communicate at ultrasonic frequencies, they may pick up the trees' vibration and attack the weakened trees. Researchers are now running tests with potted trees that have been deprived of water to see if the sound is what attracts the insects. “Water-stressed trees also smell differently from other trees, and they experience thermal changes, so insects could be responding to something other than sound”, one scientist said.

The word “parched” in paragraph 1 is closest in meaning to     .

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Most Americans eat three meals (40) ______ the day: breakfast, lunch, and dinner. Breakfast begins between 7:00 and 8:00am, lunch between 11:00 am and noon, and dinner between 6:00 and 8:00 pm. On Sundays "brunch" is a (41) ______ of breakfast and lunch, typically beginning at 11:00 am. Students often enjoy a "study break" or evening snack around 10:00 or 11:00 pm. Breakfast and lunch tend to be light meals, with only one (42) ______. Dinner is the main meal. (43) ______ breakfast Americans will eat cereal with milk which are often mixed (44) ______ in a bowl, a glass of orange juice, and toasted bread or muffin with jam, butter, or margarine. Another common breakfast meal is scrambled eggs or (45) ______ omelet with potatoes and breakfast meat (bacon or sausage). People who are on (46) ______ eat just a cup of yogurt. Lunch and dinner are more (47) ______. When eating at a formal dinner, you may be overwhelmed by the number of utensils. How do you (48) ______ the difference between a salad fork, a butter fork, and a dessert fork? Most Americans do not know the answer (49) ______ But knowing which fork or spoon to use first is simple: use the outermost utensils first and the utensils closest to the plate last

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The invention of the airplane , like many great inventions, was initially met with ridicule and disbelief. Although many people who heard about the first powered flight on December 17, 1903, were excited and impressed, others reacted with peals of laughter. The idea of flying an aircraft was repulsive to some people. Although Orville and Wilbur Wright, the inventors of the first flying machine, were called impulsive fools, the Wrights continued their experiments in aviation. Orville and Wilbur Wright had always had a compelling interest in aeronautics and mechanics. As young boys they earned money by making and selling kites and mechanical toys. Later, they designed a newspaper-folding machine, built a printing press, and operated a bicycle-repair shop. In 1896, when they read about the death of Otto Lilienthal, the brother's interest in flight grew into a compulsion. Lilienthal, a pioneer in hang-gliding, had controlled his gliders by shifting his body in the desired direction. This idea was repellent to the Wright brothers, however, and they searched for more efficient methods to control the balance of airborne vehicles. In 1900 and 1901, the Wrights tested numerous gliders and developed control techniques. The brothers' inability to obtain enough lift power for the gliders almost led them to abandon their efforts. After studying and experimenting with model wings in a wind tunnel, the Wright brothers designed their first airplane in 1903 for less than one thousand dollars. They even designed and built their own lightweight gasoline engine. On December 17, they successfully flew the plane for twelve seconds and 120 feet, despite a turbulent start. By 1905 the Wrights had perfected the first airplane that could turn, circle, and remain airborne for half an hour at a time. Others had flown in balloons or in hang gliders, but the Wright brothers were the first to build a full-size machine that could fly under its own power. As the contributors of one of the most outstanding engineering achievements in history, the Wright brothers are accurately called the fathers of aviation.
The Wright brothers searched for ways to control the balance of airborne machines by ______

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According to the Sleep Council, 20 million people in the UK aren‘t getting enough sleep 3 and some experts now believe that ―sleep debt‖ can impair your metabolism and disrupt hormone levels. To(2) ____ out how (3)_____ you need, says sleep expert Professor Chris Idzikowski, director of the Sleep Assessment and Advisory Service, (4)_____ your alarm for when you (5)______ to get up, then count back six to eight hours, (6) ______ on how much shut-eye you feel you need. Try to go to bed at this time every night, and get up at the same time - even at weekends. If you (7)______ feel tired during the day, go to bed earlier by 15 minutes a week until you wake up refreshed. So if you (8)_____ go to bed at 11 pm, say, go at 10.45 pm for a week. If you‘re still tired, try going at 10.30 the (9)_____ week, and so on. Remember, too: a weekend afternoon nap can help (10)_____ up for any missed hours in the week.

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According to a magazine article I read recently, we (1) _____live in an age of increasing leisure. Not only are more and more people reaching (2) _____ age with their taste for enjoyment and even adventure relatively (3) _____ but the working week is becoming shorter and the opportunities for (4) _____ are becoming greater and greater all the time. Not to mention the fact that people tend to spend less time traveling to work or may even be working from home. What I can‘t understand, however, is who these people are. As far as I can (5) _____ the whole thing is another one of those journalistic fictions. I admit that there are a lot of retired people (6) _____but I am not sure that all of them are dashing about learning hang-gliding or sailing single-handed (7) _____ the world. My own parents seem to spend most of their time gazing at the television. And as for the shorter working week, I wish someone would remind my company about it. I seem to be working longer hours (8) _____the time. The little leisure time I have is eaten into by sitting in traffic jams or waiting for trains to (9) _____up at rain-swept platforms. I haven‘t noticed any dramatic improvements in my (10) _____either, but perhaps I just have to wait until I get my pension

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
Do you know that your place on the family ladder may have certain effects on the sort of person you grow up to be? You may be the only child, the eldest, youngest or (1)..............one; you may be the youngest of three boys or the eldest girl with a younger brother and sister. All the different combinations of relationships will have helped to make you the person you are. (2).................. of years between your siblings and you also helps to shape your character.
Knowing such details about your best friend or loved one (3)............ also tell you about the type of friend or partner he needs. For example, a boy with a younger sister would normally (4)......... much better with a girl who has an older brother than with a girl who has a younger brother. Similarly, if your girlfriend is the oldest in her family, she would probably be more than a little domineering.
Fortunately for all of us, family psychology is not totally accurate. There are always exceptions to the rule.  Most  important  of  all,  we  should  always  judge people (5)................ to who they are, not the relatives they have.

(5)....................

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One of the hottest topics on the international development agenda is how to harness the power of International Monetary Fund for the benefit of developing countries. What is sometimes called ―the death of distance‖, brought about by the (55) , allow (56) education and training to be provided easily and quickly to (57) areas. Some of the gains can be seen in countries as diverse as India and Morocco, where innovations range from (58) government announcements to local craftsmen selling their wares to a (59) market. But already a huge and expanding (60) divide is opening up between developed and developing nations. The major tasks facing world leaders at present is to (61) everybody on the planet with clean water, basic education and the drugs needed to fight preventable diseases. Installing a (62) in every classroom and liking us to (63) must be a lesser (64) , for the time being at least

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Television has changed the lifestyle of people in every industrialized country in the world. In the United States, where sociologists have studied the effects, some interesting observations have been made. Television, although not essential, has become a(n) (1) _____ part of most people‘s lives. It has become a baby-sitter, an initiator of conversations, a major transmitter of culture, and a keeper of traditions. Yet when what can be seen on TV in one day is critically analyzed, it becomes evident that television is not a teacher but a sustainer. The poor (2) ______ of programs does not elevate people into greater (3) ______. The (4) _______ reason for the lack of quality in American television is related to both the history of TV development and the economics of TV. Television in America began with the radio. Radio companies and their sponsors first experimented with television. Therefore, the close relationship, (5) _______ the advertisers had with radio programs, became the system for American TV. Sponsors not only paid money for time within programs, but many actually produced the programs. Thus, (6) _______ from the capitalistic, profit-oriented sector of American society, television is primarily (7) _______ with reflecting and attracting society (8) _______ than innovating and experimenting with new ideas. Advertisers want to attract the largest viewing audience possible; to do so requires that the programs be entertaining rather than challenging. Television in America today remains, to a large (9) _______, with the same organization and standards as it had thirty years ago. The hope for some evolution and true achievement toward improving society will require a change in the (10) _______ system

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However objective we believe ourselves to be, most of us do not judge a product solely on its merits, considering quality, value and style before making a decision. (1)________, we are easily influenced by the people around us. There is nothing (2)___________ with this. It is probably a smarter way to make decisions than (3)________ on only our own opinions. But it does make life hard for companies. They have long understood that groups of friends and relatives tend to buy the same products, but understanding the reasons has been tricky. It is because they are so similar with (4)_______ to how much money they make and what television ads they watch that they independently (5)________ at the same decision? Or do they copy one another, perhaps (6)______ envy or perhaps because they have shared information about the products? Research in Finland recently found overwhelming evidence that neighbours have a big influence on buying decisions. When one of a person‘s ten nearest neighbours bought a car, the chances that that person would buy a car of the same brand during the next week and a half (7)__________ by 86 per cent. The researchers argued that it was not just a (8)_________ of envy. Used cars seemed to attract neighbours even more than new cars. This suggested that people were not trying to (9)_______ up with their neighbours, they were keen to learn from them. Since used cars are less reliable, a recommendation of one can (10)________influence a buying decision

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A recent issue of a language learning magazine has consulted a number of experts in the (1)________ of second language acquisition. Their advice may prove invaluable for those (2)______ a language course. One suggestion is that you (3)______whether you are likely to be successful at learning a language or not. Did you enjoy studying languages at school, for example? Do you have enough time to learn a language? The main (4)______will be your own time and effort. Therefore you must make sure that the course on offer leads to a (5)______ qualification. Also, be realistic in your (6)______. If you don't set achievable aims you are more likely to give up. Do not be deceived (7)______thinking that the most expensive courses are the best. (8)______around to get the best possible value for money. You should also bear in mind that the quicker you learn a language the more quickly you forget it. Sandra Miller, a French teacher, tried to teach herself German by enrolling on a (9)______ course. Already fluent in four languages and with a sound knowledge of teaching methodology her chances of (10)______progress were high. Three years on she remembers very little. She feels her biggest mistake was not to build on her previous studies. "I should have consolidated what I'd learnt by continuing to study, even if it were by myself."

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Mobile phones emit microwave radio emissions. Researchers are questioning whether exposure to these radio waves might (36) _______ to brain cancer. So far, the data are not conclusive. The scientific evidence does not (37) _______ us to say with certainly that mobile phones are categorically (38) _______. On the other hand, current research has not yet (39) _______ clear adverse effect associated with the prolonged use of mobile phones Numerous studies are now going (40) _______ in various countries. Some of the results are contradictory but others have shown an association between mobile phone use and cancer. (41) _______, these studies are preliminary and the issue needs further, long - term investigation. (42) _______ the scientific data is more definite, it is prudent for people to try not to use mobile phone for long (43) _______ of time. Don't think that hands free phones are any safer either. At the moment, research is in fact showing the (44) _______ and they may be just as dangerous. It is also thought that young people (45) _______ bodies are still growing may be at particular risk

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Years ago there were many social rules and etiquette procedures (1)_______ introductions. Some formal introductions between two people were (2)_______ by letter by third party. A person had to be very careful to weigh the importance of social class or status, age, and gender when deciding (3)_______ person should be presented or introduced to the other person first. (4) ________, times have changed, and most of the social rules about introducing older people to younger ones, women to men, and those in higher positions to those in lower positions have changed, too. Many people now feel much more (5) _______ about making introductions. In most situations, handshaking is (6) ________, but these days it is more often done than not-especially in formal social or business settings. It's very common for one person (or both) to (7) ________a hand when meeting someone. If you are in this situation, and you are offered a hand to shake, you should grasp it firmly and shake it briefly. People often tend to make some (8)_____________about someone (9)_________ to their handshakes, so make sure yours is not too weak or limp, not too hard, and not too longlasting. (10) _________should be firm and brief

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Speech is one of the most important (35) ...... of communicating .It consists of far more than just making noises . To talk and also (36) ........ to by other people, we have to speak a language ,that is, we have to use combinations of (37).......  that everyone agrees to stand for a particular object or idea. Communication would be impossible if everyone made up their own language.  Learning a language properly is very (38)........ . The basic (39)......... of English is not very large, and not only about 2,000 words are needed to speak it quite (40)............ .But the more idea you can (41)........ the more precise you can be about their exact meaning. Words are the (42)........ thing we use in communicating what we want to say. The way we(43)........... the words is also very important. Our tone of voice can express many emotions and (44).......... whether we are pleased or angry, for instance

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We are using up the world‘s petroleum. We use (1)_________ in our cars and to heat our building in winter.Farmers use petrochemicals to (2) _________ the soil rich. They use them to kill insects (3) _________ eat plants. These chemicals go (4) _________ rivers and lakes and kill the fish there. Thousands of pollutants also go into the air and pollute it. Winds carry this (5) _________ air to other countries and other continents. Poor farmers use the same land over and (6) _________ . The land needs a rest so it will be better next year. However, the farmers must have food this year. Poor people cut down forests (7) _________ firewood. In some areas when the trees are gone, the land (8) _________ desert. Poor people can‘t save the environment for the (9) _________ . This is not a problem for one country or one area of the world. It is a problem for allhumans. The people and the nations of the world must work together to (10) _________ the world‘s resources.

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According to the Sleep Council, 20 million people in the UK aren‘t (1)____ enough sleep 3 and some experts now believe that ―sleep debt‖ can impair your metabolism and disrupt hormone levels. To (2) ____ out how (3)_____ you need, says sleep expert Professor Chris Idzikowski, director of the Sleep Assessment and Advisory Service, (4)_____ your alarm for when you (5)______ to get up, then count back six to eight hours, (6) ______ on how much shut-eye you feel you need. Try to go to bed at this time every night, and get up at the same time - even at weekends. If you (7)______ feel tired during the day, go to bed earlier by 15 minutes a week until you wake up refreshed. So if you (8)_____ go to bed at 11 pm, say, go at 10.45 pm for a week. If you‘re still tired, try going at 10.30 the (9)_____ week, and so on. Remember, too: a weekend afternoon nap can help (10)_____ up for any missed hours in the week

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In the 1960s, The Beatles were probably the most famous pop group in the whole world. Since then, there havebeen a great many groups that have achieved enormous fame, so it is perhaps difficult now to imagine how sensational The Beatles were at that time. They were four boys from the north of England and none of them had any training in music. They started by performing and recording songs by black Americans and they had some success with these songs. Then they started writing their own songs and that was when they became really popular. The Beatles changed pop music. They were the first pop group to achieve great success from songs they had written themselves. After that it became common for groups and singers to write their own songs. The Beatles did not have a long career. Their first hit record was in 1963 and they split up in 1970. They stopped doing live performances in 1966 because it had become too dangerous for them - their fans were so excited that they surrounded them and tried to take their clothes as souvenirs! However, today some of their songs remain as famous as they were when they first came out. Throughout the world, many people can sing part of a Beatles song if you ask them.

The first songs of the Beatles were     .

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Can you imagine what life would be like if there were no telephone? You could not call (1) _____ your friends on the phone and talk to them. If fire (2) ____out in your house you could not call the fire department. If somebody was sick, you could not call a doctor. In our daily life we need to (3) ____ with one another. We need do this mostly by speaking to other people and listening to (4) ___ they have to say to us, and when you are close (5) _______ them you can do this very easily. However, our voices will not travel very far even when we shout. The man who (6) _______ this possible was Alexander Graham Bell, a Scotsman, born in Edinburgh in 1847. Bell, a teacher of visible speech who later moved to Canada, (7) _____all his spare time experimenting. (8) _____enthusiastic was he in his research for a means of sending speech (9) ____ electricity that he left much time for his day-to-day work and at one time was (10)_____ penniless

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Sugar tastes sweet because of thousands of receptors on the tongue which connect the substance with the brain. The taste of sweetness is (1) ____ accepted as the most pleasurable known although it is a fructose Abundant is the most common occurring sugar, (2) ____of which include fruit and honey. Sucrose which supplies glucose to the body, is (3) ____ from the sugar cane plant, and white sugar (pure sucrose) is used by food technologists to (4) ____ sweetness in other substances. Approximately a dozen artificial (5) ____ have been discovered; one of the earliest was Sorbitol from France. Manufacturers (6) ____ large amounts of sugar to foodstuffs but never more than the (7) ____ required to produce the optimum pleasurable taste. Surprisingly, this (8) ____ is similar for different people and in different cultures. No one has (9) ____ discovered a way to predict whether a substance will taste sweet, and it was by (10) ____ alone that all the man-made chemical sweeteners were found to be sweet