Many things that were once considered useful and _____, for example, tobacco, is now thought harmful.

More ________ information is needed to help us work out the real situation. 

The government tried its best to _____ the people’s needs, but the people were still not_______. In fact, what the government did was not________. 

 If you want to make progress, you’d better be strict _____ yourself ______your studies.

___ is known to all, China will be an _____ and powerful country in 20 or 30 years’time.