If _____ to look after luggage for someone else, inform the police at once.
It’s a pity that the quarrel________their friendship.
The number of traffic accidents caused by drinking is ____ as the number of those caused by non-drinking driving.
In China ______ graduates go abroad to have a further study every year .
----- Where did you get to know her? ---- It was on the farm _______ we worked.
——I’m sorry , but there’s no smoking on this flight . ——Oh, I _______that .Sorry , I won’t again .