She has been doing（）on how children learn language.

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• Cathy is a harsh parent, who（）to being quite strict with her children.
• Longfellow was often referred to as the “Children'；s Poet”.
• Children learn by adults .
• Parents always have their children ____.
• Which word or phrase should be deleted?　The children cried when Freud was killed because of their past memories of Freud.