完成对话通读对话，根据上下文补全对话内容。
A: 1._____________________ , Sir. Could you tell me how to get to the post office?
B: Sure. Go along this street. When you reach the traffic lights, turn left. At the end of the road, you’ll see it.
A: It’s very kind of you. By the way, 2. _____________________?
B: No, it is not very far.
A: Can I take a bus to get there?
B: 3. _____________________ .
A: 4. _____________________ ?
