【題目】Don't l at that old man. It's not polite(禮貌的).

【答案】laugh
【解析】不要嘲笑那個老人，那是不禮貌的。根據(jù)句意、所給單詞的首字母和介詞at，可知這個單詞是laugh，和介詞 at一起構(gòu)成詞組laugh at意為嘲笑；句中don't是助動詞，助動詞后加動詞原形，所以答案是laugh。

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