单项选择题

You'd better let me know as soon as there is a(n) ______ position in the branch office.

A. empty
B. vacuum
C. hollow
D. vacant
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Smoking is so harmful to personal health that it kills______people each year than automobile accidents.
A. more seven times
B. seven times more
C. as seven times
D. seven times as
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Between 1897 and 1919 at least 29 motion pictures in which artificial beings were portrayed______.
A. have been produced
B. were produced
C. were to be produced
D. had been produced
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