摘要：turn- down/turn- up 关小声/调大声音
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Remember to ______ the lights when you leave your class-room．
A．turn on B．turn off C．turn up D．turn down
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The baby is sleeping.Please tell him _________ the TV a bit.?
A.turn up B.turn off?
C.to turn down D.to turn on?
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Remember to______the lights before you leave the lab.
A. turn on B.turn off C.turn up D.turn down
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