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

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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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举一反三

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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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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—I"m going to Hangzhou for a holiday this weekend.
—____ you are there, can you buy me some green tea?

[ ]

A. Because
B. If
C. While
D. After

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