补全对话。

A: 1_______. Could you please tell me the way to the post office?

B: Sure. Go down the road and then turn left. It's next to Xinhua Bookstore.

A: 2_______?

B: It's about 10 minutes' walk.

A: Can I take a bus?

B: 3_______.

A: 4_______ bus can I take?

B: The No.9 bus or the No. 12 bus.

A: I see. Thank you very much.

B: You're 5_______.