It ________be the vocabulary that caused you the problem in ..

It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. A.may B.couldn’tC.shouldD.needn’t

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"Look at him! He behaved _____ nothing had happened", said..

"Look at him! He behaved _____ nothing had happened", said Mary.A. as if B. even ifC. if D. unless

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Don't use water to put out the fire if oil catches fire. ..

Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.A.shallB.mustC.mayD.will

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The medicine works more effectively _____you drink some hot ..

The medicine works more effectively _____you drink some hot water after taking it.A. as B. until C. although D. if

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_____I am concerned, we can walk or take the bus rather than..

_____I am concerned, we can walk or take the bus rather than call a taxi.A. Now thatB. As soon asC. So long as D. As far as

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