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The first effective step in historic preservation, however, ____ what buildings or sites are worthy of protection

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Everyone wants to reduce pollution. But the pollution (30) _____ is as complicated as it is serious. It is complicated because much pollution is caused by things that benefit people. (31) _____, exhaust from automobiles causes a large percentage of air pollution. But the automobile provides transportation for millions of people. Factories discharge much of the material that pollutes the air and water but factories give (32) _____ to a large number of people. Thus, to end or greatly reduce pollution immediately, people would have to (33) _____ using many things that benefit them. Most of the people do not want to do that, of course. But pollution can be gradually reduced in several ways. Scientists and engineers can work to find ways to lessen the amount of pollution that such things as automobiles and factories cause. Governments can pass and enforce laws (34) _____ require businesses and traffic to stop, or to cut down on certain polluting activities

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The fall in the number of deaths from heart disease is generally attributed to improvements in diet

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The more frequently droughts happen, _______ our life will become

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He wasn't aware that only one mistake could________his chances of getting the job

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The General Certificate of Secondary Education or the GCSE examinations for (30) _____ are the standard school-leaver qualifications taken by virtually all UK students in the May and June following their 16th birthday. If you come to a UK independent school before (31) _____ the age of 16, you will study towards GCSE examinations in up to 12 subjects. Some subjects are compulsory, including English arid mathematics, and you can select (32) _____, such as music, drama, geography and history from a series of options. GCSEs provide a good all-round education that you can build on at college and eventually at university. AS- and A-levels are taken after GCSEs. They are the UK qualifications most(33) _____ accepted for entry to university and are available in subjects from the humanities, arts, sciences and social sciences as well as in vocational subjects such (34) _____ engineering, and leisure and tourism. You can study up to four subjects at the same time for two years

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It is obvious that dinosaurs died ____________ millions of years ago

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Mr. Hoang found it difficult to be in charge of the household ____

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Major spending is required to ......... substantial improvements in housing

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His willpower helped him _____________ through all obstacles.

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The teacher requires Rose______by heart 15 English words each day

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Since our train leaves at 10.30, it is _____ that everyone be at the station no later than 10.15

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Our new cooling system is of high quality and ------- to all aspects of the building code.

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Polar bears are in danger of dying out. (25) _____ 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 reduced in size by about 30 per cent. The temperature in the Arctic has slowly been rising and this is (26) _____ the sea ice to melt, endangering the polar bears' home. The polar bears' main sources of food are the different types of seals found in the Arctic. They catch them by waiting next to the air holes seals have made in the ice. (27) _____ the bears are very strong swimmers, they could never catch seals in water. This means that the bears really do rely on the ice to hunt. Polar bears also need sea ice to travel. They can cover a huge territory and often swim from one part of the ice to another. They have been (28) _____ to swim up to 100 km, but when there is less ice, they may have to swim further and this can (29) _____ fatal to the bears. A number of bears have drown in the last few years and scientists believe that it is because they were not able to reach more ice before they became too tired and couldn't swim any further

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Taking a gap year will allow you to reach a level of emotional ________ that will stay with you for a lifetime

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The boy, along with his classmates, ______just paid me a visit

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Does your mother _____________ special foods on New Year?

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I will let you in. I ________ with the keys by the time you come in.

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You really should ..... and see our new house

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It's been a few months since we've seen my mother-in-law so we need to ______________ a visit this weekend

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Xoan singing is a vocal art of villages in the ancestral land of Phu Tho. It has been ____ for generations and the oral tradition is still very much alive today