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:
Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.
Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon- 14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon- 14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.
Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.

Which of the following is NOT true about carbon-14?

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Everyone wants to reduce pollution . But the pollution problem is ( 1 ) …………….. complicated as it is serious . It is complited ( 2 ) …………… much pollution is caused by things that benefit people . ( 3)………. , exhaust from automobiles causes a lartge percentage of air pollution . But the automobile (4 ) …..provides transportation for millions of people . Factories discharge much (5)……. the material that pollutes theair and water , but factories give employment to a large munber of people . Thus , to end (6)……… greatly reduce pollution immediately , people would have to ( 7) ….. using many things that benefit them . Most of the people do not want to do that , of course . But pollution can be ( 8) ….. reduced in several ways . Scientists and engineers can work to find ways lessen the (9) ………. Of the pollution that such things as automobiles and factories cause . Governments can pass and enforce laws that (10) ……….businesses and traffic to stop , or to cut down on certain polluting activities

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.
The warming of the Pacific Ocean has created weather patterns (1)..........strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases.  Australia could (2)..................experience a drought in many parts. On the other hand, Chile  (which borders the Pacific Ocean) is preparing  for (3)............ rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier.
This happening is called El Nino and is used by weather forecasters to make long-range weather predictions. They also know that El Nino will unusually bring heavy rains to the southwestern part of the United States and make the central part of the country drier at the same time.
According to research, weather forecasters used to know about the coming weather with certainty. Now everything has become completely different.
El Nino itself used to be (4)............. It would occur every two to seven years. But now, this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (5)...............on a global scale either.

(3)..............................

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Work should be a meaningful and (1)___ part of one‘s life. The (2)____ of a career is, therefore, one of the most serious decision anyone can (3)___. It is important to take in consideration your (4)___ and personal preferences. For instance, adventurous people who enjoy an outdoor life shouldn‘t choose a (5)___ in an office. If you like to work alone, you shouldn‘t look for employment which requires working with the public. If you enjoy working with people, you may like a career in a (6)___ such as human resources. You should (7)____ about finding out as much as possible about intended career before you finish your education. It may take time to (8)____ for the career you want. Don‘t accept a job if you haven‘t got a clue what your working conditions will be or how much you can expect to (9)____. Future disappointment can be avoided by talking to professionals with (10)____ in the career you are interested in as well as visiting different companies and institutions.

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Schools in the United States have not always had a large number of libraries. As (42)______ as 1958 about half of the public schools in the United States had no libraries at all. The (43)______ of public school libraries increased dramatically when the federal government passed the Elementary and Secondary Education Act of 1965, (44)______ provided funds for school districts to improve their education programs and facilities, including their libraries. (45)______, many educators claim that since the legislation was passed federal spending has not increased sufficiently to meet the rising (46)______ of new library technologies such as computer databases and Internet access Because the federal government provides only limited funds to schools, individual school districts (47)______ on funds from local property taxes to meet the vast majority of public school expenses. Therefore, the libraries of public schools tend to reflect the (48)______ capabilities of the communities in which they are located. Districts in wealthy suburbs often have fully staffed libraries (49)______ abundant resources, spacious facilities, and curricular and instructional support. In (50)______, school districts in many poor areas house their libraries in ordinary classrooms or in small rooms. The libraries in such areas are generally staffed by volunteers, who organize and (51)______ books that are often out-of-date, irrelevant, or damaged

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Earth is the only place we know of in the universe that can support human life. (1) _____ human activities are making the planet less fit to live on. As the western world (2) _____ on consuming two-thirds of the world's resources while half of the world's population do so just to stay alive we are rapidly destroying the (3) _____ resource we have by which all people can survive and prosper. Everywhere fertile soil is (4) _____ built on or washed into the sea. Renewable resources are exploited so much that they will never be able to recover (5) _____. We discharge pollutants into the atmosphere without any thought of the consequences. As a (6) _____ the planet's ability to support people is being reduced at the very time when rising human numbers and consumption are (7) _____ increasingly heavy demands on it. The Earth's (8) _____ resources are there for us to use. We need food, water, air, energy, medicines, warmth, shelter and minerals to (9) _____ us fed, comfortable, healthy and active. If we are sensible in how we use the resources, they will (10) _____ indefinitely. But if we use them wastefully and excessively, they will soon run out and everyone will suffer

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Polar bears are in danger of dying out. (45) _________ some other endangered animals, it‘s not hunters that are the problem, it‘s climate change. Since 1979, the ice cap at the Arctic Circle where the polar bears live has (46) _________ in size by about 30 percent. The temperature in the Arctic has slowly been (47) _________ and this is (48) _________ the sea ice to melt, endangering the polar bears‘ home. The polar bears‘ main (49) _________ of food are the different types of seal found in the Arctic. They catch them by waiting next to the air holes the seals have (50) _________in the ice. (51) _________ the bears are very strong swimmers, they could never catch seals in the water. This means that the bears (52) _________ do rely on the ice to hunt. Polar bears also need sea ice to travel. They can (53) _________ a huge territory and often swim from one part of the ice to another. They have been known to swim up to 100km, but when there is less ice, they may have to swim further and this can (54) _________ fatal to the bears. A number of bears have drowned in the last few years and scientists believe that it is because they were not able to reach more sea ice before they became too tired and couldn‘t swim any further

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Do you ever wish you were more optimistic, someone who always (45)____ to be successful? Having someone around who always fears the worst isn't really a lot of (46)____ - we all know someone who sees a single cloud on a sunny day and says, 'It looks like rain.' But if you catch yourself thinking such things, it's important to do something about it. You can change your view of life, according to psychologist. It only takes a little (47)___, and you'll find life more rewarding as a (48)____. Optimism, they say, is partly about self-respect and confidence but it's also a more positive way of looking at life and all it has to (49)____. Optimists are more (50)_____ to start new projects and are generally more prepared to take risks. Upbringing is obviously very important in forming your (51)___ to the world. Some people are brought up to depend too much on others and grow up forever blaming other people when anything (52)____ wrong. Most optimists, on the (53)____ hand, have been brought up not to (54)____ failure as the end of the world - they just get on with their lives

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Around 200 million people are employed in tourism worldwide, making it the largest industry in the modern global economy. It is estimated that three-quarters of a billion people (35)___________ on holiday each year, and industry planners expect this figure to double by 2020. Some of the biggest beneficiaries are less developed countries, (36)___________it is often their main source of income. (37)_________________, along with the economic benefits, this mass movement of people has resulted in threats (38)_____________ the environment. People often forget the damage caused by carbon dioxide emissions from aircraft, which (39) ______________ directly to global warming. Deforestation has cleared land in order to build hotels, airport and roads, and this has destroyed wildlife. In some areas, water shortages are now common (40)_____________of the need to fill swimming pools and water golf courses for tourists. By pushing up prices for goods and services, tourism can also be (41)______________ to the people who live in tourist destinations. In response to these concerns, some travel operators now offer environmental friendly holidays. Many of these aim to reduce the negative (42)____________ of tourism by promoting only hotels that have invested equipment to recycle waste and use energy and water efficiently. Increasingly, tourists are also being reminded to show respect (43)______________ the customs of the people (44) ______________countries they are going to visit, and to support local businesses, such as restaurants and shops, which depend on tourism for their main income

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__55)______ history, women have always aimed for a recognized place in (56)________ Guided by their own (57)________of knowledge and expertise, women like Marie Curie in science, Mary Wollstonecraft in literary writing, Simone de Beauvois in philosophical existentialist debate, and Marie Stopes in medicine, to name a few, have brought about (58)________awareness of the role of women in any walks of life. These women have helped redefine and (59)________the nature of women‘s place in society. Today the (60)________of global women's organizations and the impact of women's contributions (61)________society show that progress has been made and the progress in furthering the role of women in society has been some benefits to the (62)________woman. It is true to say that not all women have the same need. The need of the woman who stays at home and (63)________children will differ widely from the woman who works outside. Nonetheless, in the extensive field of equal opportunities, it would be good to know that access is given to both with equal measure according to the true value of respective abilities. It also would be good to know that the woman at home is recognized as a valued (64)________of society just as much as the one who deals with business outside the home.

Read the following passage and choose the best answer (A, B, C, D):
The Forbidden City is the former imperial palace in the center of Beijing, China. Construction began in 1406, and the emperor’s court officially moved in by 1420. The Forbidden City got its name because most people were barred from entering the 72-hectare site, surrounded by walls. Even government officials and the imperial family were permitted only limited access. Only the emperor could enter any section at will. The architecture of the Forbidden City conforms rigidly to traditional Chinese principles. All buildings within the walls follow a north-south line and the most important ones face south to honor the sun. The designers arranged the other buildings, and the ceremonial spaces between them, to impress all visitors with the great power of the Emperor, while reinforcing the insignificance of the individual. This architectural concept was carried out to the smallest detail. For example, the importance of a building was determined not only by its height or width but also by the style of its roof and the quantity of statuettes placed on the roof’s ridges. In recognition of the importance of its unparalleled architecture, UNESCO added the palace to its World Heritage List in 1987. Today, visitors from all over the world do not wait for an imperial invitation to walk about this palace, now a museum of imperial art. One of the most impressive landmarks of the Forbidden City is the Meridian Gate, the formal entrance to the southern side of the Forbidden City. The gate, with its auxiliary wings on either side of the entryway, is 38 meters high at its roof ridge. When you stand in front of this majestic structure, you understand how awed people felt when they stood there listening to imperial proclamations. As you walk through the gate, you come into a large courtyard, 140 meters long and 210 meters wide. Running through the courtyard is the Golden River, which is crossed by five parallel white marble bridges. These bridges lead to the Gate of Supreme Harmony, which, in turn, leads to the heart of the Forbidden City. At the northernmost end of the Forbidden City is the Imperial Garden, which is totally different from the rest of the compound. Instead of rigid formality, you see a seemingly spontaneous arrangement of trees, fishponds, flowerbeds, and sculpture. Here is the place of relaxation for the emperor.
5. Which word or phrase is closest in meaning to the word “spontaneous“?

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One of the most urgent environmental problems in the world today is the shortage of clean water. Having clean drinking water is a basic human right. But acid rain, (1) ________ pollution and garbage have made many sources of water undrinkable. Lakes, reservoirs and even entire seas have become vast pools (2) ________ poison. Lake Baikal in Russia is one of the largest lakes in the world. It (3) ________ a rich variety of animals and plants, including 1,300 rare species that do not exist (4) ________ else in the world. But they are being destroyed by the massive volumes of toxic effluent which (5) _______ into the lake every day. Even where law existed, the government did not have the power to enforce them. Most industries simply ignore the regulations. The Mediterranean Sea (6) ________ 1% of the world's water surface. But it is the dumping (7) ________ for 50% of all marine pollution. Almost 16 countries regularly throw industrial wastes a few miles (8) ________ shore. Water is free to everyone. A few years ago, people thought that the supply of clean water in the world was limitless. Today, many water supplies have been (9) ________ by pollution and sewage. Clean water is now scarce, and we are at last beginning to respect this precious (10) ________. We should do something now

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Few people now question the reality of global warming and its effects on the worlds climate. Mary scientists (1) ________ the blame for recent natural disasters on the increase in the worlds temperatures and are convinced that, more than (2) ________ before, the Earth is at risk from the forces of the wind, rain and sun. (3) ________ to them, global warming is making extreme weather events, such as hurricanes and droughts, even more (4) ________ and causing sea levels all around the world to (5) ________ . Environmental groups are putting (6) ________ on govemments to take action to reduce the amount of carbon dioxide which is given (7) ________ by factories and power plants, thus attracking the problem at its source. They are in (8) ________ of more money being spent on research into solar, wind and wave energy devices, which could then replace existing power (9) ________ . Some scientists, (10) ________ , believe that even if we stopped releasing carbon dioxide and other gases into the atmosphere tomorrow, we would have to wait several hundred years to notice the result. Global I warming, it seems, is to stay

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How many times in the last hundred years or so have people talked of the imminent death of the book? Films were an early threat because they were so effective at telling stories in a visual way. Next there was radio, (26)...... stepped into the mid-twentieth century and provided such an alternative to books as drama, documentaries and discussions. When television arrived, many people believed that it would finish the book off. Nowadays, (27)............ the threat by TV, the book is thought to be endangered by computers and the Internet, and by other technological attractions (28).........  theCD and the video game, too Surely there are now reasons why (29).............  book ought to be dead, or at least very badly injured. If so, why does it not show proper respect for these reportedly less literate times (30)......... die out? There is clearly more than a single answer to this question. Firstly, we have more leisure time than we(31)..........  to, and people are generally living longer, which means there is more time to do more (including reading books). As (32)............ as this, there is the strength of the book as a tradition. We are all too dismissive of traditions in our modern world, but they can have very strong pull (33)....... us. Added to this, the book is such a practical tool: it doesn't cost too (34).......... , it is usually small enough to carry around, and it can easily be (35)......... . We will never go without books, because they have served us so well for so long

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Nearly 200 of the 1500 native plant species in Hawaii are at risk of going extinct in the near future because they have been (1) ____ to such low numbers. Approximately 90 percent of Hawaii's plants are found nowhere else in the world but they are (2) ____ by alien invasive species such as feral goats, pigs, rodents and (3) ____ plants. The Hawaii Rare Plant Restoration Group is striving to (4) ____ the extinction of the 182 rare Hawaiian plants with fewer than 50 individuals remaining in the (5) ____ . Since 1990, (6) ____ a result of their "Plant Extinction Prevention Program", sixteen species have been brought into (7) ____ and three species have been reintroduced. Invasive weeds have been removed in key areas and fencing put up in order to (8) ____ plants in the wild. In the future the Hawaii Rare Plant Restoration Program aims (9) ____ collecting genetic material from the remaining plants in the wild for storage as a safety net for the future. They also aim to manage wild populations and where possible reintroduce species into (10) _____

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:
Most Americans look forward to their vacation. Most American employees receive an annual vacation with pay, and it is traditional to use this time off for travel.
Travelling within the United States is very popular because foreign travel generally takes more time and money. Every year about thirteen million people travel abroad. The most popular periods are during the summer and the two-week school break on Christmas and New Year holidays. These periods are also the most crowded and the most expensive time to travel, so people who can adjust their schedules sometimes choose to travel in the autumn.
American tourists often travel by car. Most families own a car, and those who do not have a car can rent one. Cars are usually the most economical way to travel, especially for families. It is also fairly fast and convenient. Exellent highway with motels and restaurants nearby connect the nation’s major cities. They enable tourists to travel at a speed of 55 to 66 miles an hour. Tourists that want to travel faster often fly to their destination and then rent a car when they get there.

According to the writer     .

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Work should be a meaningful and (1)___ part of one‘s life. The (2)____ of a career is, therefore, one of the most serious decision anyone can (3)___. It is important to take in consideration your (4)___ and personal preferences. For instance, adventurous people who enjoy an outdoor life shouldn‘t choose a (5)___ in an office. If you like to work alone, you shouldn‘t look for employment which requires working with the public. If you enjoy working with people, you may like a career in a (6)___ such as human resources. You should (7)____ about finding out as much as possible about intended career before you finish your education. It may take time to (8)____ for the career you want. Don‘t accept a job if you haven‘t got a clue what your working conditions will be or how much you can expect to (9)____. Future disappointment can be avoided by talking to professionals with (10)____ in the career you are interested in as well as visiting different companies and institutions.

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Education is more important today than ever before. It helps people acquire the skills they need for such everyday (13)_______ as reading a newspaper or managing their money. It also gives them the specialized training they may need to (14)_______ for a job or career. For example, a person must meet certain educational requirements and obtain a (15)_______ or certificate before he can practice law or medicine. Many fields, like computer operation or police work, (16)_______ satisfactory completion of special training courses. Education is also important (17)_______ it helps people get more out of life. It increases their knowledge and understanding of the world. It helps them acquire the skills that make life more interesting and enjoyable, (18)_______ the skills needed to participate in a sport, paint a picture, or play a musical (19)_______ . Such education becomes (20)_______ important as people gain more and more leisure time. Education also helps people adjust to change. This habit has become necessary because social changes today take place with increasing speed and (21)_______ the lives of more and more people. Education can help a person understand these changes and provide him (22)_______ the skills for adjusting to them

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The Thames is the longest and best-known river in Britain. It is 210 miles/338 kilometres ___(1)___ and flows from the Cotswolds in central England to the North Sea after through London. Other famous towns on the river ___(2)___ Oxford, Windsor 1, Henley and Greenwich. ___(3)___ bridges across the Thames in London are London Bridge, Tower Bridge and Westminster Bridge. Large ships can sail ___(4)___ the Thames ___(5)___ London and smaller ones a further 86 miles/138 kilometres. A large area in the east of London was formerly a major port on the river, but in recent times this Docklands area has been___(6)___. The Thames Barrier is a large barrier ___(7)___ across the River Thames at Woolwich, east of London, to prevent London from being flooded. It was completed in 1982 and ___(8) ___ opened in 1984. It consists of ten gates, which ___(9)___ on the bottom of the river when the barrier is not required. If there is a danger of flooding, the gates rise to form a solid ___(10)___ 50 feet/15 metres high.

Millions of people are using cell phones today. In many places, it is actually considered unusual not to use one. In many countries, cell phones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected.

The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.

On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a travelling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree.

What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

As the discussion about their safety continues, it appears that it’s best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often

The man mentioned in the passage, who used his cell phone too often, ________.

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Higher Education in the UK Students who have successfully completed an A-level course may go to university to do (1)_____ three- or four-year course leading to a first degree such as Bachelor of Arts (BA), Bachelor of Science (BSc), etc. They apply to several universities which then (2)_____ an offer of a place specifying the minimum grades the student needs to obtain in the A level subjects studied. Higher education is not (3)_____. In principle, students have to pay a contribution to the cost of teaching (tuition fees) and have also to pay their living costs (maintenance). The government provides (4)_____ to help them pay for university education which have to be paid back from earnings once their income reaches a certain (5)_____. In recent years government policy has been to (6)_____ the percentage of 18-year olds (7)_____ go to university, which is now, at 40%, double the 1990 figure, but this growth has been at the (8)______ of the amount of financial support given to individual students. Universities receive money (9)_____ the state for each student and are responsible for employing staff and deciding which courses to offer. The head of a university, who is (10)_____ for its management, is called a vice-chancellor.