补全对话。
Kate: 1._____
Lucy: I'm trying to find the children's programme.
Kate: 2 ._____
Lucy: It's usually found on Channel 1. But I can't get anything now.
Kate: It must be on Channel 2. Try that, please.
Lucy: I've tried it. I still can't get anything.
Kate: 3._____
Lucy: I've tried all of them.
Kate: There must be something wrong with the TV.
Lucy: 4._____ I have to take it to Uncle Wang.
Kate: Good idea. If he can't repair it, nobody can!
A. I'm afraid you may be right.
B. Which channel is it on?
C. What about the other channels?
D. What are you doing, Lucy?
