A. devote to translating

　　B. devote himself to translate

　　C. be devoted to translate

　　D. be devoted to translating

　　27. Recently people have made great progress in using________power of nature to produce________electricity.

　　A. a; the

　　B. /; /

　　C. the; /

　　D. a; an

　　28. In disasters, the rescue work________three parts, of which saving people’s lives is the most important one.

　　A. makes up of

　　B. consists of

　　C. links to

　　D. divides into

　　29. It took a great deal of courage to admit that all his efforts had been________.

　　A. in danger

　　B. in turn

　　C. in return

　　D. in vain

　　30. I felt________the speech he gave us, for it was too long.

　　A. boring with

　　B. tired from

　　C. exhausting with

　　D. bored with

　　31. ________there is less and less coal and oil, scientists are exploring new ways of making use of alternative energy, such as sunlight, wind and water for power and fuel.

　　A. As

　　B. Since

　　C. With

　　D. If

　　32. He always________the mistakes made by his rivals.

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