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Studies _____ that children who often take part in cooperative programs benefit a lot more than other children.
They are such a ______ family---- they must have been shocked when their son dyed his hair pink.
Testing students by examinations has long been regarded as a reliable way to ______ students' ability.
Many power stations have been modernized to give off less pollution, or they were moved further away from the living areas in order to _______ the damage.
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