对话后的选项中选择适当的选项补全对话，把相应的字母番号填在方框下面的横线上。 A: Hello! May I speak to Mr Smith? B: I'm sorry. 1_______ A: When will he come back? B: I think he'll be back in an hour. 2_______ A: That's very kind of you. I'd like him to come to my birthday party. 3_______ B: Certainly. 4_______ I'll go and get a pen and a piece of paper. Now please give me your phone number. A: 7667569. My name is Liu Wei. B: All right. 5_______ A. Could I take a message? B. Can I leave my telephone number for you? C. Wait a minute, please. D. He isn't here right now. E. I'll tell him to call you back.