Either you or one of your family members __________the opening ceremony next week. 

—Lu does work hard. —Yeah. _____ of his time ______been spent on studies every day. 

In my opinion, some of the news  _____  unbelievable.

The number of smokers in China ________ decreased in recent years.

 The number of smokers in China ________increased in recent years, and a number of them _________ the youth.