The airport is usually your first stop before_ _ _ _on your vacation or trip.
A. leave
B. leaving
C. left
D. to leave
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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
They opened a new store in our city,but not until last week_ _ _ _it.
A. we visit
B. we would visit
C. did we visit
D. have we visited