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21. We can never expect bluer sky unless we create less polluted world. A. a; a B. a; the C. the; a D. the; the 22. Is it to hold the 2010 World Exhibition _______ makes Shanghai the focus of the world?A. when B. that C. which D. what23. I like _____ in the spring when the weather is warm and everything begins to grow. A. this B. that C. these D. it 24. Many new means__________ to prevent the river ____________.A. have found, from pollutingB. have found, from being pollutedC. have been found, from being pollutedD. has been found, from being polluted25. Most people would agree that nuclear science should be developed to benefit the human beings_______ harm them. A. more than B. other than C. better than D. rather than26. His ability is beyond question; ______ has been in doubt is ______ he is prepared to work hard. A. what; that B. what; whether C. which; whether D. that; that 27. It had been half an hour before she found herself _____ in the wrong direction of her home. A. walking B. to walk C. walked D. walk28.—Did the winner of the English Contest behave well?—Really. She made a deep ________ on the judges.A.idea B.feeling C.impression D.sense
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