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··Structure··Section A21. Each worker puts in nearly 2 200 hours a year,_____________average, and contributes about $ 30 to GDPper hour.

A)with
B) in
C)on
D) under

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22. If you have difficulty_________your bills, tell your utility company as soon as possible.

A)pay
B) paid
C) to pay
D)paying

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

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