问题详情：
补全对话：根据对话内容，在每小题的空白处写出一个完整的句子，使对话意思完整。
Mary: Hello! May I speak to Li Lei?
Li Lei: （1）
Mary: Hi, Li Lei. What are you going to do this afternoon?
Li Lei: I’ll have classes this afternoon. （2） ?
Mary: I need help. If you can’t come, can you call Peter for me instead?
Li Lei: OK. （3） , please. I’ll see if he is in.
（A moment later）Sorry, he is not in at the moment.
Mary: Oh. Can you tell him to ring me up when he comes back?
Li Lei: （4） . Does he know your number?
Mary: I’m not sure. Just write down my number and give it to him.
Li Lei: OK. I will leave a message on his desk.
Mary: （5） . Good bye!
Li Lei: Bye-bye.
【回答】
1. This is Li Lei speaking. / Speaking.
2. What’s the matter / What’s wrong / What’s your trouble / What can I do for you.
3. Hold on / wait a moment / minute / Just a moment / minute
4. No problem / Sure / Of course / OK / All right.
5. Thank you（very much）/ Thanks / Thanks a lot.
知识点：补充句子
题型：补全对话
