补全对话A：Excuse me.Is there a post office near here?B:______, I

补全对话
A：Excuse me.Is there a post office near here?
B:______, I don't know.I'm new here.
A:Excuse me,______is the nearest post office?
C:____________?
A:Where is the neareat post office?
C:Post office?I don't know. I am____another city.
A:Excuse me.Is there a post office near here?
D:Sorry.I don't know.Ask a______,please.
A:But I am a policeman.