The company used 50 percent of the raw materials, the rest of which __________ sent to other cities to help the factories there.

Though having lived abroad for years, many Chinese still_______the traditional customs

For some time the expert __________ people of the health risks caused by passive smokingHe says he won’t stop until all the smokers around him decide to quit smoking

Not until he failed in the last examination _________he should have spent more time on study.

I never doubt _____ this exhibition is worth ________.