补全对话

Sam: Don't sit on the chair!

Alice:    1   

Sam: Look! One of its legs is broken. It's dangerous to sit on it.

Alice: Thank you for telling me.   2   

Sam: I don't know.

Alice: Let's tell our teacher about it. Maybe he can mend it.

Sam:    3   But I can mend it myself.

Alice: Yourself? Have you learned to mend a chair?

Sam: Yes. My father is a worker.    4   And he's taught me how to do that.

Alice:    5   May I help you with it?

Sam: Certainly. Let's begin.

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