| 1. | He's also as sharp as a tack.
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| 2. | "Mentally he's as sharp as a tack ."
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| 3. | He is not merely as sharp as a tack, he is the standard by which they sharpen tacks.
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| 4. | She is as sharp as a tack, has a great sense of humour and keeps up on local and world news.
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| 5. | "A few years ago, her memory was as sharp as a tack . . . . I've never had so many worries in my life ."
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| 6. | At 103, she's got all her own teeth, doesn't need glasses to read the newspaper-including the stock pages-and has a memory and wit as sharp as a tack.
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