II．单项选择 15% （共15题；每小题1分，满分15分）
21. The volunteers are doing _____ difficult and important work; they share ____ common goal to help people in need.
A. a; a B. a; the C. 不填; the D. 不填; a
22. ----Must I get the report typed tonight?
----No, you ____. I won’t need it until next week.
A. mustn’t B. needn’t C. shouldn’t D. can’t
23. Seeing that he was so seriously ill, I insisted that he _________ to hospital at once.
A. was sent B. be sent C. will be sent D. had been sent
24. I was about to go shopping _________ it began to rain.
A. while B. as C. when D. though
25. I’ll tell you _________ he told me last week.
A. all which B. that C. all that D. which
26. People ______ at the meeting would have a discussion on pollution.
A. were present B. took part in C. join in D. present.
27. Many teenagers like to play computer games ___ roles can be chosen as they like.
