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B,   E The sentence opens with the word “When,” which functions as a straight-ahead road sign. The missing word will be in accord with the key words in the first half of the sentence. The patron wants an “amusing” and uplifting author. Predict something like “laughter” or “joy.” Choices (B)   mirth and (E) merriment both mean “gladness” or “hilarity,” and are the correct answers. Choices (A) lugubriousness and (C) poignancy both mean “sadness,” and are the opposite of what you’re looking for. Finally, choices (D) gravity and (F) solemnity both mean “dignity” or “seriousness,” and are likewise the opposite of what you want.
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