11.After our plane______, we________ for an hour for our luggage.
A.landed/ had waited
B.had landed/waited
C.has landed/waited
D.was landing/ waited
12.Water pollution______ mainly by industrial waste and sewage from households.
A.is caused
B.was caused
C.causes
D.are caused
13.I’m used_____in such a noisy place.
A.sleeping
B.to sleeping
C.sleep
D.to sleep
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