If you want to visit the museum, you have to book your visit at least 2 days advance.
A. on
B. in
C. for
D. with
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average, call center workers in the company make between $ 9 and $ 14 an hour.
A. On
B. With
C. Over
D. To
The mechanical trouble has prevented them from finishing the task on .
A. duty
B. order
C. time
D. plan
The school was _______ in 1929 by a Chinese scholar.
A. established
B. placed
C. imaged
D. made
The task will not be fulfilled ___________we get help from the other departments.
A. if
B. unless
C. since
D. when