A:Excuse me,please.Is there apost office near here?
B:（Sorry）.I don't know.I'm new here.
A:Excuse me,（where） is the nearest post office?
C:（Pardon）?
A:Where is the nearest post office?
C:Post office?I am （from） another city.
A:Excuse me,please.Is there a post office near here?
D:Sorry.I don't know.Ask a （policeman）.
A:But I am a policeman,