8. 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.
无可否认，空气污染是一个极其严重的问题：城市当局应该采取有力措施来解决它。
9. An investigation shows that female workers tend to have a favorable attitude toward retirement.
一项调查显示妇女欢迎退休。
10. A proper part-time job does not occupy students” 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.
一份适当的业余
