( )31. When Jack arrived_________the airport, he found it hard to look for a place to park his car.
A. in B. at C. on D. to
( )32. The nurse won't leave her patients __________she is sure they are all taken good
A. unless B. because C. so D. if
( )33. This house is one of ___________buildings in the town. We must take actions to
A. old B. older C. oldest D. the oldest
( )34. For our own safety, it's important to __________the traffic rules on the way to
A. follow B. change C. make D. break
( )35.You _________ go through the security(安全) check before getting on the train.
A.can B. must C. may D. might
( )36.---How long __________you ____________these two books?
---For nearly two weeks. I'll return them to the library tomorrow.
A. have, borrowed B have, bought C.have, had D have, kept
( )37. ---Mum, shall I leave todav's homework till tomorrow?