According to a UN report，one third of the world population have no _________ to clean drinking water and health care.

He asked Mary whether she had passed the exam ________．

In order to create a comfortable shopping environment, the mall placed a(n)     on smoking.

Sometimes we need both cultural________ and government action—a change in values and a change in policy—to promote the kind of society we want.

In the time of social reform, people’s state of mind tends to keep       with the rapid change of society.