1.Air p_____is a serious problem in the world now.2.People will have m____free time in the future

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1.Airp_____isaseriousproblemintheworldnow.2.Peoplewillhavem____freetimeinthefuture1.Airp_____isaseri

1.Air p_____is a serious problem in the world now.2.People will have m____free time in the future
1.Air p_____is a serious problem in the world now.2.People will have m____free time in the future

1.Air p_____is a serious problem in the world now.2.People will have m____free time in the future
pollution,more