The happy student was singing _____ he was walking.[ ]A. until B. asC. sin

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The happy student was singing _____ he was walking.[     ]
A. until
B. as
C. since
D. and

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举一反三

We didn"t look after the old woman _____we had an important meeting yesterday.[     ]
A. as soon as
B. until
C. since
D. so

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I didn" t fall asleep _____ my son came back home. [ ]
A. until
B. when
C. that

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—Whose picture is better, Jack"s or Tom"s?
—Both of them are good.  I think Jack draws ___________ Tom.[     ]
A. as good as
B. as well as
C. better than
D. worse than

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_____ you"re the boss, you should decide what to do next. [     ]
A. Whether
B. After
C. As
D. Though

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We should do ______ the tcacher told us.[     ]
A. because
B. like
C. as
D. since

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