11. _______ for your help, we’d never have been able to get over the difficulties.
　　 A. Had it not
　　 B. If it were not
　　 C. Had it not been
　　 D. It we had not been
　　 12. ______ he’s already heard the news.
　　 A. Chances are
　　 B. Chance is
　　 C. Opportunities are
　　 D. Opportunity is
　　 13. _______ his knowledge and academic background, he is basically stupid.
　　 A. But for
　　 B. According to
　　 C. For all
　　 D. Thanks to
　　 14. _______ his return from Japan, Prof. Li went directly to his laboratory and started working with his colleagues.
　　 A. Upon
　　 B. At
　　 C. Within
　　 D. Over
　　 15. _______ I am concerned, some other arrangement would have been better.
　　 A. So far
　　 B. As for
　　 C. As far as
　　 D. So far from
　　 16. _______ I saw you I knew you were angry with me.
　　 A. A moment
　　 B. The moment
　　 C. In a moment
　　 D. For a moment
　　 17. _______ in government was exposed through the agency of the press.
　　 A. Corruption
　　 B. Cosmetic
　　 C. Cottage
　　 D. Costume
　　 18. _______ in the dark, his head hit against the wall.
　　 A. Walking
　　 B. His walking
　　 C. When he was walking
　　 D. While walking
　　 19. _______ is a term for the partial or complete inability to hear.
　　 A. There is deafness
　　 B. Deafness that
　　 C. It is deafness
　　 D. Deafness
　　 20. _______ is known to the world, Mark Twain is a great American writer.
　　 A. That
　　 B. Which
　　 C. As
　　 D. It

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