单项选择题

When the post of sales manager fell ______, Dennis Bass was appointed to fill it immediately for his excellent performance in this field during the past three years.

A. empty
B. vacant
C. hollow
D. bare
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Hartford & Associates has publicized ______Mrs. Freeman will be the newest member to their legal team.
A. because
B. while
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Before we install a new heating system we should be sure we cannot make ______use of the one we already have.
A. efficiently
B. efficiency
C. efficient
D. more efficiently
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