题目内容

Before going out, his mother ______ at him to be careful.

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Researchers point out that praise could be a weak ______ (强化剂;刺激物) for children's behavior.

They have to ______ (增强,加强(观点、看法、感觉等) the coordination between each other if they want to win this match.

We all carry a lot of emotional ______ (思想上的包袱) around with us.

It was a ______ (使感到卑贱的;使自惭的) experience to see the villagers being so positive about life when they had so little.

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