21.Japan is ________ the east of China. Taiwan is ____ the southeast of China.
A. in; in
B. to; in
C. on ; to
D. in; to
解析：选B. 日本位于中国东部(外面)用to, 台湾位于中国东部(内部)用in。
22.The postman shouted, “ Mr Green, here is a letter ________ you.”
A. to
B. from
C. for
D. of
解析：选C. 介词的考查。句意：Mr Green, 这是你的信。学生容易误选A。
23.He hasn’t heard from his friend __________ last month.
A. since
B. by the end of
C. for
D. until
解析：A. 此题学生容易受思维定势not… until…的影响误选D。since用于现在完成时，如果此题是一般过去时就选择D。
24.—Jimmy lost his key yesterday.
—________? It’s his third time in just one month.
A. Has he
B. Did he
C. Was he
D. Does he
解析：B. 根据上一句一般过去时可以判断。
25.You’ve passed the exam. I’m happy ______ you.
A. on
B. at
C. in
D. for
解析：选D. 句意：你考试及格了，我为你高兴。
26. I wonder ________ they finished so many different jobs in such a short time.
A. why
B. how
C. when
D. where
解析：选B. 句意：我想知道他在如此短的时间内是怎样完成这么多不同工作的。
27. —Ought I to go right now?
—_________.
A. That’s very bad.
B. Yes, you go ought to
C. Yes, you ought
D. No, you ought not to
解析：选D. 句子的肯定回答为：Yes, you ought to. 否定回答为：No, you ought not to.
28. I don’t know when he ________. When he _______ here, I’ll call you in a minute.
A. will come; will arrive
B. comes; arrices
C. will come; arrives
D. comes; will arrive
解析：选C. 第一句是宾语从句根据语境用一般将来时，第二句是时间状语从句，由于主句是一般将来时，那么从句要用一般现在时来代替。
29. He turned ________ the radio a little because his father was asleep.
A. on
B. down
C. up
D. off
解析：选B. 此题学生会误选D. 但后面有个副词短语a little, 故选择B, 意为：把收音机调小一点，父亲在睡觉。如果去掉a little则选择D。
30. I don’t know the homework _______ today.
A. on
B. in
C. of
D. for
解析：选D. 句意：我不知道今天的家庭作业。
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