— I"m going to the post office. —_____ you"re there, can you get me some stamps?

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— I"m going to the post office.
—_____ you"re there, can you get me some stamps? [ ]
A. As
B. While
C. Because

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举一反三

You won"t catch the bus _______ you run.             [     ]
A. unless
B. if
C. until

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I was doing my homework ____ a dog came in.[     ]
A. when
B. while
C. as
D. at

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I left my umbrella in my room. Could you wait _____ I go back to get it? [ ]
A. if
B. before
C. while

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—Please write here. I"ll come back soon.
—All right. We won"t leave ______ you come back.[ ]
A. since
B. until
C. while

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I hope to go to France some day _____ there are many famous art museums. [ ]
A. when
B. if
C. because
D. whose

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