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.

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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.

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