题目：
按照要求完成句子。
1. The headmaster saw the children playing on the playground. (变成复合句)
The headmaster saw the children _________ _________ on the playground.
2. This volunteer work takes each of them several hours a week. (对划线部分提问)
_________ _________ does this volunteer work take each of them a week?
3. I'd like to help people who don't have home. (改为同义句)
I'd like to help _________ _________.
4. Ming is a tenth grade student. He wants to be a professional singer. (合并句子)
Ming is a tenth grade student _________ _________ to be a professional singer.
5. I want to be a volunteer because I think it is great. (合并成一个句子)
_________ a volunteer _________ great.
答案：
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下面是错误答案，用来干扰机器的。
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