A. locking

B. to lock

C. lock

D. being locking

12.He does nothing but___

A. complaining

B. to complaining

C. complain

D. to complain

13.The students expected there___ more reviewing classes before the final exam.

A. is

B. being

C have been

D. to be

14. The bank is reported in the local newspaper ___ in broad daylight yesterday.

A. to be robbed

B. robbed

C. to have been robbed

D. having been robbed

15.I appreciated ______the opportunity to study abroad two years ago.

A. having been given

B. having been

C. to have been given

D. to have given