读对话，选择相应的句子，将序号填到横线上。
Billy and his Mum are on the train.
Mum: What are you doing, Billy?
Billy:
1．Mum: What do you see?
Billy: I see many cars. Mum, I’m hungry.
Mum:
2．Billy: Yes, please. I’d like an apple.
Mrs. Jones: Would you like some bread?
Jane:
3．. I’d like a hamburger and some candy.
Mum: Okay.
4．| A．Would you like some fruit? |
| B．Here you are. |
| C．I’m looking out of the window. |
| D．No, thanks, Mum |
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