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Cats sleep day and hunt night.

A. in, in B. at, at
C. during, during D. by, by

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In the long run, English learning, difficult as it is, is ______ to a learner in his or her career development.

A. profitable
B. advantageous
C. prominent
D. rewarding

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Daniel didn't want to play second, ______ to his elder brother.

A. piece
B. instrument
C. music
D. string

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