根据对话内容， 在方框中选择适当的句子补全对话。（5分）

（ Kangkang: K　　　　　 Michael: M　 ）　

M：What are you doing?

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K : __________________ .

M：What’s the matter with it?

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K : ____________ I pressed the “ON” button but nothing happened.

M：Well, are you sure you plugged it in?

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K : ______________________________

M：You’d better ask our computer teacher for help.

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K: ____________________ But I’m not sure whether he is free.

M: Don’t worry. He’ll be glad to help you.

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K: _________________ He is always warm-hearted.　　　　　

	A． I think so. B． I will. Thank you. C． I’m repairing my computer. D． It doesn’t work. E. Of course. But it’s useless.