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!