选择合适的句子，补全对话。
A. You shouldn't eat too much meat!
B. I'm a good boy now.
C. What are you doing?
D. And you should eat some fruit.
E. What are you eating?
A: ________
B: I'm having lunch.
A: ________
B: I'm eating meat.
A: ________You should eat some vegetables.
B: OK, Mum.
A: ________
B: OK, Mum.
A: What a good boy!
B: Yes. ________
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