1.There is no denying the fact that air pollution is an extremely serious problem :the city authorities should take strong measures to deal with it.

2.An investigation shows that female workers tend to have a favorable attitude toward retirement.

3.A proper part-time job does not occupy student’s too much time .In fact ,it is unhealthy for them to spend all of time on their study .As an old saying goes :All work and no play makes Jack a dull boy

4.Any government which is blind to this point may pay a heavy price.

5.An increasing number of people are beginning to realize that education is not complete with graduation.