We should do what we have to do________ we can do what we want to do in the future.
The number 911 is _____ special number, _______, I think, that will be remembered by the Americans forever.
The woman pulled her hat low down ____ her eyes in order not to be recognized by the angry crowds.
The story ______, and everybody knows about it.
Those who know ____ it was that wrote “ A Tale of Two Cities”, raise your hands.
If better use ______your spare time,you’ll make good progress in doing your business.