看一看，读一读，完成句子。
1. ---What is he doing?
---He __________.
2. ---What are they doing?
---They _________.
3. ---What _________ the boy doing?
---He _________.
4. ---What _________ Wang Yan _________?
---He _________ the floor.
5. ---What is the girl doing?
---She _________.
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