Chongqing ______ a lot in the past few years.
A．has changed B. changed C. is changing
Mr. Smith didn’t tell us ______.
A. where he lives B. where he lived C. where did he live
—How many people did you see in the meeting room?
— ______.
A. Nothing B. No one C. None
— Your bike is very beautiful. How long ____you _____it? — Just two weeks.
A. have; bought B. did; buy C. have; had
—Look! What a nice classroom! — Yes, it ________ every day.
A. is cleaning B. has cleaned C. is cleaned
—It smells terrible. What has happened here?
—Look, there is a chemical factory ____waste water___ the river.
A. pour; into B. pouring; into C. poured; to
