My sister can’t ________ in a river.
You must______your cigarette when you are at the gas station.
Her grandparents are still in good health_____they are over eighty.
-What do you think of his concert? -Oh,no one does____.
-Have you got the airplane tickets? -No, because it's May Day ,all the tickets to Beijing______out.
There was an accident. at the corner,______the girl wasn’t_______hurt.