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

A. who B. whom

C. which D. as

22. All _____ is a continuous supply of the basic necessities of life.

A. what is needed B. that is needed

C. for our needs D. thing needed

23. The goals _____ he had fought all his life no longer seemed important to him.

A. for that B. for which

C. for what D. of them

24. Snowdonia is a seashore city _____ you can enjoy yourselves much by visiting the local scenic spots.

A. why B. which

C. where D. so

25. The inflation made it hard for us to buy the necessities ____.

A. which need us B. that we need

C. what we need D. as we need

26. Those were the soldiers _____ to save the town.

A. whose responsibility was B. in whom there was a responsibility

C. whose was the responsibility D. from whom the responsibility

27. It won‘t be long _____ the modern communications spread over all the villages in china.

A. when B. before

C. until D. as

28. 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

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

A. when B. in which

C. at which D. which

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

A. when B. in which

C. at which D. which