Our country is taking action to ______ air pollution．（ ）
A．cut downB．cut upC．cut outD．cut off
Do you still play basketball？
Oh， no． I ______ it for the past three years．（ ）
A．haven't playedB．didn't play
C．won't playD．hadn't played
I still don' t know what____ while I was away from home．
You'll know it all some day， l believe．（ ）
A．had happenedB．would happen
C．has happenedD．happened
My sister______ the piano very well， but she hasn't had time to play recently．（ ）
A．will playB．has playedC．playedD．plays
It's very kind of you to help me． Thank you very much．
______．（ ）
A．Thank you
B．Don't thank me
C．Sorry to help you very little
D．You are welcome
How is the young man？
_____________．（ ）
A．He's twentyB．He's much better
C．He's a doctorD．He's Mr Smith