20. The size of the audience, ________we had expected, was well over one thousand.
A. whom B. who C. which D. as
19. _____________you may face, you must gather your courage to finish it.
A. However a difficult task B. What a difficult task
C. However difficult a task D. What difficult a task
18. ------May I go to the cinema this evening?
------___________. We should do the work in the nursing house.
A. Take it easy B. Forget it
C. Don't mention it D. Couldn’t agree more
17. If nature does not provide man with the necessary material, it is the laboratory ____ he will turn to for it.
A.where B.that C.which D.what
16.Whenasked how he liked his job, he said he was happy _____ he was.
A.what B.who C.where D.how