根据下面的对话内容，从对话前的选项中选出最佳选项填入空白处，将代号填入空白处。选项中有一个多余选项。
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.
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A: It's very late. Are you still on the computer?
B: Well, yes. ____
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:____ Usually people want a quick reply.
A:____
B: I've already had 40 people's addresses in my address book!____
A:____ E-mail is really very convenient(方便的).
