选择句子，完成对话。
Mary: Hello, Lucy!
1． I want to post a letter.
Lucy: OK. Let's go.
2．Mary: I'll post it to America.
Lucy:
3．Mary: I think ten yuan or more.
Lucy: That's too dear. Why not send an e-mail on the computer?
Mary: That's a good idea.
Lucy:
4．Mary: Yes, I can. Let's go and find a computer.
| A．How much is the postage? |
| B．Where do you post your letter? |
| C．Can you write an e-mail? |
| D．Let's go to the post office. |
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