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【Inourschool,thestudentsfromhighergradest----turnstobetrafficguards.Theyh----thestudentstogetsafelya----thebusyroadinfrontoftheschool.Ofcourse,theyhavetoknowthetrafficrules.】
题目内容：
In our school,the students from higher grades t---- turns to be traffic guards.They h---- the students to get safely a---- thebusy road in front of the school.Of course,they have to know the traffic rules.优质解答
take help across
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