16. The person _____ you were talking to was an American.

　　A. who B. whom

　　C. which D. as

　　17. She _____ playing volley-ball very much.

　　A. has B. wants

　　C. lets D. enjoys

　　18. Most of the people _____ to her party were her old friends.

　　A. Invited B. to invited

　　C. being invited D. inviting

　　19. _____ from the moon, the earth with water _____ seventy percent of its surface.

　　A. See/covered B. Seeing/covering

　　C. Seen/covering D. To see/to cover

　　20. The fact _____ doctors recommend that children with hypertension(过度紧张)drink coffee is surprising.

　　A. what B. is that

　　C. that D. of

　　21. I can never forget the day _____ I first came to college.

　　A. when B. in which

　　C. at which D. which

　　22. I can never forget the day _____ we spent together.

　　A. when B. in which

　　C. at which D. which

　　23. The reason _____ he failed the exam was _____ he had not worked hard.

　　A. why……if B. why……that

　　C. that……why D. why……what

　　24. When you called me this morning, I _____ the newspaper.

　　A. read B. was reading

　　C. reads D. have read

　　25. _____ to get there on time， we walked as fast as we could.

　　A. hoping B. to hope

　　C. hoped D. being hoped

　　26. Walking along the river, he heard someone _____ for help.

　　A. shouting B. shout

　　C. shouted D. having shouted

　　27. My vacation begins next Tuesday, _____ I will leave for Flofida.

　　A. which B. that

　　C. while D. when

　　28. He has made another wonderful discovery, _____ of great importance to science.

　　A. which I think it is B. of which I think is

　　C. I think which is D. which I think is

　　29. I decided to buy a car because we had sold _____ we had in England before leaving.

　　A. that B. the other

　　C.which D. the one

　　30. The investigation, _____ will soon be published, was made by John.

　　A. at which the results B. the results on which

　　C. whose results D. at whose results