用 when或 while填空。1. I was looking out of the window _________ the teacher asked m

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用 when或 while填空。1. I was looking out of the window _________ the teacher asked me.
2. What is he doing _________ his parents came back？
3. Mike was playing games _________ Jack was studying.
4. I was about to fall asleep _________ the baby began to cry.

答案

1. when 2. when 3. while 4. when

举一反三

All the students were sweeping the floor __________ they heard a man __________. [ ]A. when；shouting
B. while；to shout
C. when；to shout
D. while；shouting

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I was reading the evening paper _____ the light went out.                                                                                                                                                        [     ]A. when
B. while
C. as
D. after

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Newton was playing under an apple tree ____ an apple fell onto his head.[ ]
A. when
B. while
C. after
D. before

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-So you were in the supermarket __________ you heard a strange sound , right?
-That’s true. I ran out as quickly as possible.[ ]
A. when
B. while
C. then
D. which

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—What a nice T-shirt!  Can I have it, Mom?
—Well,  it really looks nice, ______ I think it"s too expensive.            [     ]
A. but
B. as
C. for
D. or

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