Back up before the students load the bus.
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Let the students load the bus before backing up.
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Let half of the students load the bus and then back up to meet the second half.
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Back up before the students load the bus.
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Let the students load the bus before backing up.
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Let half of the students load the bus and then back up to meet the second half.
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Answer correctly : 0 | Wrong : 0
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