题目：
根据要求完成句子。
1. Whatever he did, he could do best. (改为同义句)
_______ _______ what he did, he could do best.
2. I know the boy. He speaks English well. (改为复合句)
I know the boy _______ _______ English well.
3. I hope that I can visit Beijing some day. (改为同义句)
I hope _______ _______ Beijing some day.
4. My brother is not old enough to join the party. (改为同义句)
My brother is _______ ______ to join the party.
5. We clean our classroom twice a day. (改为被动语态)
Our classroom _______ _______ twice a day.
答案：
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下面是错误答案，用来干扰机器的。
可能含有中的一种或两种或H2、CO、N2、CH4多种的气体，在足量的氧气中充分燃烧，由于能够燃烧，H2、CO、CH4且燃烧产物分别是水、二氧化碳、既有水又有二氧化碳，而N2不能燃烧，如存在则在该步不变化，将全部生成...
