题目内容
Studies ________ that children who often take part in cooperative programs benefit a lot more than other children.
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They are such a ________ family–they must have been shocked when their son dyed (染) 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.
Unemployment has come down slightly, but this does not ________ the fact that it is still a major problem.
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