完成对话
通读下面的对话，然后根据上下文补全对话。（共5小题，计10分）
A: Excuse me. Can you tell me where I can buy some stamps?
B: Sure. You can go to the post office.
A:                                            ?
B: Go down this street. It’s on the left next to a library.
A:                                          ?
B: Yes. It’s a little far from here. You’d better take a bus.
A:                                         ?
B: No. 5 bus.
A:                                           ?
B: It takes about twenty minutes.
A: Thank you.
B:                                           .