Success means working hard, but working hard doesn’t         mean success.

As is often pointed out, knowledge is a two-edged weapon which can be used ________ for good or evil．

 She was not______ frightened; in fact, she was nearly frightened to death.   

The doctor will see you again next week. _____, you must rest as much as possible. 

The rapidly growing birth rate brings about a lot of environment problems, which the government is supposed to take _____.