---I am going to the office．

---________ you're there, can you get me some stamps?

1. A.
   As
2. B.
   While
3. C.
   Because
4. D.
   If

—I am going to the office.

　　 —______you’re there, can you get me some stamps? (NMET’99)

A. As　 B. While C. Because D. If

—I am going to the office.

　 　 —______you’re there, can you get me some stamps?

A. As　 B. While C. Because D. If

“I am going to the post office.”

“______ you're there, can you get me some stamps?”

[　　]