从方框中选出适当的句子补全对话，其中有两多余的。 A: It's very late. Are you still on the computer? B: Well, yes. 1 A: What kind of e-mails? B: Some are messages from my friends and some are from the relatives. A: Do you have to write them back right away? B: 2 Usually people want a quick reply. A: 3 B: I've already had 40 people's addresses in my address book! 4 A: 5 E-mail is really very convenient (方便的). A. And I think e-mail is one of the best ways to communicate with others. B. I've got so many e-mails to go through. C. I agree with you. D. Of course! E. How many e-mail addresses have you had? F. I feel like getting more e-mails. G. I am not sure whether I'm right or wrong.