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His friends $let$ him down.

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The class could not $keep\, a\, straight\, face$ on hearing the strange pronunciation of the new teacher.

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$I$ cannot get along with a man who $plays\, fast\, and\, loose$.

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The time is running out,you must $look \, sharp$.

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The sight of the accident made $my \, flesh \, creep.$

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$I$ felt $like\, a\, fish\, out\, of\, water$ among all those business tycoons.