选出恰当的句子，补全对话。
A：1.___________.I have some pictures from Winter Camp.
B：2.___________．
A: He's Mike.3._____________.
B: What's he doing?
A: 4._____________.
B: He is writing. Who is he?
A：He's Tim.
B：Look! 5.____________．
A：Haha!
A. He's singing.
B. Ted is sleeping.
C. Look, Mum.
D. Who is he?
E. He's from Canada.
A. He's singing.
B. Ted is sleeping.
C. Look, Mum.
D. Who is he?
E. He's from Canada.
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