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完形there will be a lot more people next century.Maybe there w

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完形
there will be a lot more people next century.Maybe there will be ____1 room only on the
earth 600 years ____2 .That will be a very serious problem.
So man is ____3 of a way to solve the ____4.
Scientists ____5 solve many problems ____6 man can live on the moon.
1.A.standing B.sitting C.sleeping D.doing
2.A.faster B.later C.earlier D.sooner
3.A.saying B.telling C.thinking D.knowing
4.A.matter B.accident C.question D.problem
5.A.may B.have to C.can D.will
6.A.before B.after C.since D.till
standing
later
thinking
problem
will
since