I think that something has to be done to stop the air from being polluted, ______ ?
All her hard work ________ in the end, and she finally passed the exam.
—What's the matter with John? He has been sitting there for hours.—A postcard from his father ________ an attack of homesickness in him.
Look before you leap! Why not ________ the advantages against the risks before you start?
It has been reported that some government leaders ________ their authority and position to get illegal profits for themselves.
—I will have to think about it again.—If you ________, you may lose the opportunity to compete altogether.