根据对话语境，在每个空白处填入一个适当的句子，使对话完整通顺。
A: Hello! 1_____________________________?
B: Just a moment … I'm sorry. Bob has gone out. Who is that, please?
A: Oh, this is Paul. 2_____________________________?
B: He will be back at about 7 o'clock.
A: 3_____________________________?
B: Certainly. I'm glad to do that.
A: Could you ask him to call me tomorrow afternoon?
4_____________________________.
B: 3-7-4-6-5-9-8. All right. I'll tell him as soon as he comes back.
A: 5_____________________________.
B: You're welcome. Bye!
1. May I speak to Bob? / Is that Bob speaking?
2. Do you know when he will be back? / When will he be back, do you know?
Can / Could you tell me when he will be back? When will he come / be back?
3. Could you take a message for me? / Could you take me a message? / Can I leave a message?
4. My phone number is 3746598. / 3746598 is my phone number.
Please write down my phone number, 3746598.
5. Thank you. / You are helpful. / It's very kind of you. / Thanks a lot.
答案不唯一
