按要求做题。
1. He is doing his homework.
改为一般疑问句__________________________________
2. Are they going to the classroom?
肯定回答 _______________________________
3. They are doing high jumping.
对“doing high jumping”提问：______________________________
4. Is she eating breakfast?
否定回答________________________________
5.What is Lucy doing？（sleeping）
回答问题________________________________
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