When a person wants to operate the computer, _____ read instructions first.
A．you will have toB．one must
C．they will have toD．he has to
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---I’m sorry, but the doorbell _____ too.
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Once environment damage _____, it takes many years for the system to recover.
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I _____ home than it started to rain.
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Unfortunately, his dog got __________ by the car.
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