This is the beauty and ugliness, good and evil ______.
A. on contrast
B. of contrast
C. at contrast
D. in contrast
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And anxiety can, ______, lead to a number of physical and emotional problems.
A. in turn
B. on turn
C. at turn
D. to turn
The twin brothers are alike in appearance but _____ greatly in disposition.
A. varies
B. differ
C. variety
D. Varied