Read and write. （读下面的对话并把句子补充完整）Jack: Hi.
Peter: Hello.This is Peter speaking.Is Jack here?
Jack: It's Jack here.
Peter: Jack,what are you doing?
Jack: I'm watching TV. How about you?
Peter: I'm doing my homework.Can I speak to your sister,Mary?
I have a question about the homework. What is she doing?
Jack: She is cleaning the room. Hold on,please.
Peter: OK. Thank you.
1.Peter is
2. Jack is
3. Mary is
1. Peter is doing his homework.
2. Jack is watching TV.
3. Mary is cleaning the room.
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