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9 Stamps ＿＿＿ by people for sending letters.
A. use
B. using
C. used
D. are used
［答案］ D.
［析］ 这里是被动语态，意为邮票被人们用来发信。
10 The radio says Tianjin will be ＿＿＿ tomorrow.
A. rains
B. rain
C. rained
D. rainy
［答案］ D.
［析］ rainy为形容词作表语。
11 If you don't know this word, ＿＿＿ in the dictionary.
A. look for it
B. look at it
C. look after it
D. look it up
［答案］ D.
［析］ look up 查字典，与look有关的词组有：
look about 四周环视
look after 照顾
look around 周围，四处看
look at 看
look back 回顾
look for 寻找
look forward to 期待
look out 当心
look like 看上去像
12 My father told me ＿＿＿ play on the street.
A. not
B. to not
C. not to
D. did not
［答案］ C.
［析］ 不定式的否定式是not to do something.
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