摘要:20.What do I have to do I want to be thinner. A.until B.since C.while D.if Today more and more families have their own computers.Parents buy computers 21 their children.They 22 computers can help them improve their studies in school.However.many of their children 23 computers to play games.to watch videos 24 to sing karaoke instead ofstudying.So many teachers and parents complainthat computers call not help children study 25 make them fall behind.So computers are put away 26 parents. In 27 countries.even some scientists also 28 computers.They say computers let many people 29 their jobs or 30 them a lot of trouble.

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