根据上下文，选择恰当的句子完成对话，并将选项工整地抄写在相应的横线上。（每小题2分，共10分）
John: What are you doing, Mike?
Mike: ?
John: Which season do you like best?
Mike: ?
John: I like summer, too. .
Mike: The weather is too hot. Let’s go swimming, OK?
John: Great! ?
Mike: No, he can’t. He’s busy now.
John: What is he doing?
Mike: .
John: Oh, maybe next time. Then let’s go!