根据下面所提供的对话情景，在每个空白处填入一个适当的句子，使其意思连贯，完整。

A: Excuse me, sir? Where is the nearest post office?

B:                1               ． You may ask that policeman over there．

A: Thank you anyway．

(The man goes to the policeman．)

A: Excuse me．             2             ?

C: No, there isn't a post office near here, but there is one near Xinhua Bookstore．

A:              3                ?

C: It's about three kilometers away．

A:                4                ?

C: You'd better take a taxi, because it's so late, and there aren't any buses now．

A:                 5                ．

C: You're welcome．

A: Excuse me, sir? Where is the nearest hotel?

B: 69)________________________________ You may ask that policeman over there.

A: Thank you all the same.

   (The man goes to the policeman.)

A: Excuse me. 70)________________________________

C: No, there isn’t a hotel near here, but there is one near the Bank of China.

A: 71)________________________________

C: It’s about two kilometers away.

A: 72)________________________________

C: You’d better take a taxi, because it’s so late, there aren’t any buses now.

A: 73)________________________________

C: You are welcome.

—Excuse me．Where is Mr. Green's office?

—It's on ________ floor．

A．seven                  B．the seven         C．seventh               D．the seventh