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Use "keenest" in a sentence
"Williamson, A. B., held him to the point: "I also was called the keenest student of my time," said he; "but it isn't bringing you patients.""
"The delight of genius in the act of composition has been called the keenest of intellectual pleasures; and this was the poet's almost sole reward in Canada a generation ago, when nothing seemed to catch the popular ear but burlesque, or trivial verse."
"The keenest was the man who ran the US-sponsored Poppy Eradication Programme PEP in Helmand, Charles Bennett."