4. A cork will ________ in water, but a stone sinks.
A. fly
B. flow
C. float
D. drift
5. A dark suit is preferable _________a light one for evening wear.
A. to
B. than
C. for
D. against
6. A deputy director will be _________the whole factory next week when the director is away for a month.
A. in favor of
B. in charge of
C. in place of
D. on behalf of
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