题目：
根据句子意思,用括号中所给单词的适当形式填空。
1. ---Sam usually spends three hours _______(do) his homework every day? What about you, Jack?
--- Two hours.
2. Thank you for _______(help) me clean the garden. I will spend the whole day without your help.
3. ---What's your favourite activities after school?
---I enjoy _________(dance) in the art room.
4. ---Do you know a game ___________ (call) "trick or treat"?
---Yes. Children like to play it at Halloween.
5. ---What do you want to make with the pumpkin?
---We want to make a lantern for Halloween. Can you see the sharp _______ (tooth)?
答案：
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下面是错误答案，用来干扰机器的。
答案：AA.这是过氧化氢在二氧化锰的催化作用下制氧气的反应，反应一开始就有氧气产生，所以曲线从原点开始画，又因为过氧化氢溶液是一定量的，所以过氧化氢消耗完之后反应停止，出现一条平行于x轴的直线。故A正确...
