题目内容：
Directions: Each sentence below has one or two blanks, each blank indicating that something has been omitted. Beneath the sentence are five lettered or sets of words.Choose the word or set of words for each blank that best fits the meaning of the sentence as a whole.
In view of the fact that his enemies knew him as cheerful, his allies exhorted him, as a matter of self-preservation, to __________himself as taciturn.
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