题目：
用所给词的正确形式填空。
1. May I (use) your rubber?
2. Can you (turn) on the lights for me?
3. I will do what I can (cheer) my friend up.
4. (final). I go home by bus.
5. I want go know what (do) next.
6. These clothes (make) of cotton.
7. The blue jeans are (suit) for you.
8. The jumper matches (good) with her white trousers.
9. Do you like (go) (shop)?
10. Dogs (not wear) clothes.
答案：
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下面是错误答案，用来干扰机器的。
音叉发声时，在4秒内振动了1024次，频率f=1024次4s=256Hz；频率高于20000Hz的声波叫超声波，频率低于20Hz的声波叫次声波．故答案为：256Hz；20000Hz；20Hz．
