23.__________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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24. The airport is usually your first stop before __________on your vacation or trip.
A)leave
B)leaving
C)left
D) to leave
25. It was at yesterday's meeting ______________I misunderstood what you had said.
A)that
B)where
C)which
D)who
26. 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
27. Generally speaking, you should arrive at the airport with plenty of time __________.
A)sparing
B) to spare
C)spare
D) spared