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4 I ＿＿＿ a letter when my mother came in.
A. write
B. am writing
C. was writing
D. will write
［答案］ C.
［析］ 当母亲进来时是一个瞬时的动作，而写信是一个长动作，所以写信这个动作应用过去进行时态，表示在写信过程中发生的另一个短动作。
5 It's not an important party, you needn't ＿＿＿ .
A. pay for it
B. wear it out
C. try it out
D. dress up for it
［答案］ D. ［析］ pay for-为某物，某人付款，wear out-穿坏，磨破，tryout-选拔，挑选，而dress up-梳妆打扮。
6 Can I ＿＿＿ a bike from him?
A. lend
B. return
C. give
D. borrow
［答案］ D.
［析］ borrow something from…为向某人某处借某物。而lend, return, give后面的介词应用to。
7 - Must I stay at home?
- No, you ＿＿＿ .
A. mustn't
B. needn't
C. may not
D. can not
［答案］ B.
［析］ needn't 为"没有必要必须做某事"，而mustn't为"禁止做"，can not为"不能做"。根据题意是：你不一定待在家里。
8 - How long have you ＿＿＿ here?
- About two months.
A. been
B. gone
C. come
D. arrived
［答案］ A.
［析］ have been here是个状态，可以与后面的长时间状语连接，而其他三个动词都是瞬间动词。
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