72. You can' t throw the waste everywherE. You should keep the classroom _________. A. quiet ...

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Must, can’t throw can, can’t throw could, must have throw can, can’t have thrown

losing, throwing lose, throw lose, throwing losing, throw

needn’t be thrown mustn’t be thrown can’t throw may not throw

are always throwing; wasn’t have always thrown; can’t have been have always been throwing; hadn’t been always throw; isn’t

quiet neat orderly bright

quiet neat orderly Bright

keep an eye on take advantage of throw light on keep track of

need be thrown mustn’t be thrown can’t throw may throw

could；can't throw can；can't throw could；must have thrown can；can't have thrown

try out throw away point at look for

throw empty sell bring

need be thrown mustn't be thrown can't throw may throw

put to use take advantage of throw light on keep up

need be thrown mustn’t be thrown can’t throw may throw

needn’t be thrown mustn’t be thrown can’t throw may not throw

keep an eye on take advantage of throw light on keep track of

quiet neat orderly bright

quiet neat orderly bright