1. _______ 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

　　2. ______ he's already heard the news.

　　A. Chances are B. Chance is

　　C. Opportunities are D. Opportunity is

　　3. _______ his knowledge and academic background, he is basically stupid.

　　A. But for B. According to

　　C. For all D. Thanks to

　　4. _______ 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

　　5. _______ I am concerned, some other arrangement would have been better.

　　A. So far B. As for

　　C. As far as D. So far from

　　6. _______ I saw you I knew you were angry with me.

　　A. A moment B. The moment

　　C. In a moment D. For a moment

　　7. _______ in government was exposed through the agency of the press.

　　A. Corruption B. Cosmetic

　　C. Cottage D. Costume

　　8. _______ in the dark, his head hit against the wall.

　　A. Walking B. His walking

　　C. When he was walking D. While walking

　　9. _______ is a term for the partial or complete inability to hear.

　　A. There is deafness B. Deafness that

　　C. It is deafness D. Deafness

　　10. _______ is known to the world, Mark Twain is a great American writer.

　　A. That B. Which

　　C. As D. It