Studying in groups is necessary __________ you want to do well in school. [

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Studying in groups is necessary __________  you want to do well in school.    [     ]
A. if
B. until
C. unless
D. though

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举一反三

I won’t take part in the party ______ Joe invites me. [     ]
A. if
B. when
C. unless
D. because

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My grandfather often tells me I do in the future, I should try my best to do it well.[ ]
A. however
B. whatever
C. whenever
D. wherever

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—Why does he like koalas?
—_____ he thinks they are very cute.[     ]
A. Because
B. So
C. But
D. And

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_____ the digital camera is a little expensive, I"ll buy it for my daughter.        [     ]
A. While
B. Because
C. Even though
D. As soon as

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Ed lent me an umbrella _____ I wouldn"t get wet in the rain.[     ]
A. that
B. so that
C. in order to
D. for

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