(2013·安徽合肥二模)—The cars give off a great deal of waste gas in the streets.—YesBut I’m sure something will be done to ________ air pollution

Could you tell me how long __________ thefootball club?

In fact he knows this place very well, for he ________ there three times.

People read newspapers and magazines in order to keep themselves _____ of what is going on in the world outside.

I think the music is great, it is worth ______.