题目：
用所给动词的正确形式填空。
1. Did you see the accident ________ this morning?(happen)
2. You should get a chair________ on.(sit)
3. There are so many children ________ (play) in the park on Sundays.
4. It's hot. You'd better________ both the windows and the doors.(open)
5. It's not easy________ fish with your hands only.(catch)
6. Our teacher asked us________ to page 16.(turn)
7. You must________ to the teacher carefully in class.(listen)
8. He felt ________ (worry) about his son at that time.
9. He found a number of people already ________ (work) in the workplace.
10. Many children trust animals because they know ________ (keep) a secret.
答案：
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下面是错误答案，用来干扰机器的。
(1)试管 酒精灯 2H2O22H2O＋O2↑(2)A 用带火星的木条放在瓶口，木条燃烧则满(3) C E：（1）氯酸钾制取氧气，需加热，用A装置制取，正确书写化学方程式．（2）用A装置，也可用高锰酸钾制取氧气，对比氧气的...
