21 . ________evidence that language acquiring ability must be stimulated.
A. If being B. It is C. There is D. There being
22. Professor Wang , _______ for his informative lectures, was warmly received by his students.
A. knowing B. known C. to be known D. having known
23.In fact Peter would rather have left for San Francisco than ____ in New York.
A. to stay B. stayed C. stay D. having stayed
24.You ____ him so closely; you should have kept your distance.
A. shouldn't follow B. mustn't follow
C. couldn't have been following D. shouldn't have been following
25. There has been a great increase in retail sales , ____﹖
A. does there B. isn't there
C. hasn't there D. isn't it
26. It is the news ____ most parents of the hope that there is a safe and socially approved road to a kind of life they themselves have not had, but their children can.
A. that deprive B. that it deprives
C. that deprives D. when it deprives
27. We hadn't met for 20 years, but I recognized her_____ I saw her.
A. the moment B. for the moment
C. the moment when D. at the moment when
28. On hearing a great noise, Mike looked forward through the window _____ what happened outside the room.
A. to seeing B. to see C. seeing D. to have seen
29. You ______ be driven out of the school if you dare to cheat in the exam.
A. should B. would C. will D. shall
30. Everyone hopes that we can do something to make things better, so we can't help ______ under the stress.
A. but working B. but to work C. work D. but work
21. C 句中有连词that和谓语must be stimulated，缺少一个谓语动词，排除A,D，该句译成汉语是"有。。。的证据",而不是"它是。。。的证据"所以排除B.
22. B
23. C
24. D
25. C
26. C
27. A 定冠词the加上表示时间的名词起连词作用，引导时间状语从句。如the night/ the minute/ the spring/ the year等。
28. B look forward to doing sth. / sth. 表示"盼望做某事"，而look forward to do sth.表示向前看目的（要做。。。）
29. D shall用于第二，三人称表示说话人的心愿； will表示主语的心愿。
30. D can't help but do…相当于 have to do….。
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