_ _ _ _most students own a smartphone,the school does not allow them to use it in the classroom.
A. Even though
B. In case
C. Now that
D. If only
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The airport is usually your first stop before_ _ _ _on your vacation or trip.
A. leave
B. leaving
C. left
D. to leave
He stayed patient and answered every single question,_ _ _ _obvious the answer was.
A. no matter when
B. no matter whether
C. no matter what
D. no matter how
Generally speaking,you should arrive at the airport with plenty of time_ _ _ _.
A. sparing
B. to spare
C. spare
D. spared
In most cases,panel interviews were_ _ _ _than those held by single interviewers.
A. more reliable
B. reliable
C. most reliable
D. least reliable