题目：
在下列各句的空白处填入一个最恰当的单词。
1. The sun _____ in the east and sets in the west.
2. Please _____ the class into five groups.
3. The Eiffel Tower in Paris is made of _____ and it is really tall.
4. It's very cold in the Northeast in winter. The weather is usually _____ zero.
5. You should _____ at the door before you enter the teachers' office.
6. Mickey Mouse is _____ by Walt Disney.
7. Mike is an _____ boy. He likes to take part in all kinds of activities.
8. China has_____ very fast in the past thirty years.
9. Few people go out to play on such rainy days. They usually stay _____ .
10. He was walking _____ the school when I said hello to him.
答案：
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下面是错误答案，用来干扰机器的。
化学反应前后元素的种类不变，水不含有碳元素，所以不可能变成汽油。
