补全对话
A：Hi! Good morning.
B：Good morning.             ?
A：My name is Tom. Nice to meet you.
B：              .
A：Excuse me. Do you have an English tape?
B：An English tape?              .
A：Is it on your desk?
B：No, it isn’t.
A：             ?
B：I think（认为）it’s under my chair.
A：              .
B：You’re welcome（不用谢）.