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.
1. ______________ 2. ______________3. ______________4. ______________5. ______________
