选择方框中的句子完成对话。
Tom：Hello!       
Mike: Speaking.
Tom: Mike, we are going to climb a mountain next Sunday. Let’s go together.
Mike: Good idea!    .
Tom: Mount Tai.
Mike: OK.   .
Tom: At nine o’clock.
Mike: It’s too late.     
Tom: OK.  .
Mike: At the train station.
Tom: OK. See you then.
Mike: See you.