题目内容

David stayed ______ about this issue, no matter who asked him.

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He was ______ lucky to find his lost purse and mobile phone.

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

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.