The official was looking at a postcard sadly ____ his workmate came in. [ ]A

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The official was looking at a postcard sadly ____ his workmate came in. [ ]
A. while
B. when
C. after
D. before

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举一反三

________ he isn"t rich enough, he often gives away money to some poor children .[ ]
A. Though
B. When
C. Because
D. If

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No matter what you do, you can’t change the situation.[    ]
A. whoever
B. wherever
C. whatever
D. what ever

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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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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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