_____the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
_____ worries me is _____ we’re going to pay for all this.
I’m afraid we can’t have coffee; there’s _____ left.
The classroom is almost empty, where is _____?
Don’t go to _____ places where there is no fresh air.
Energy is ____ makes one work.