World No Smoking Day is ________ May 31. A. in B. on C. at
I can’t stand ________ TV for a long time.
------It’s getting cold. Would you mind _________ the window?------Of course not.
Parents play a role in _________their children.
Of the three pencil boxes, the boy chose __________one.
-----What does he _________soap operas?-----He doesn’t like them.