s have brought many serious problems like crime and prostitution.

　　越来越多的专家相信移民对城市的建设起到积极作用。然而，越来越多的城市居民却怀疑这种说法，他们抱怨民工给城市带来了许多严重的问题，象犯罪和卖淫。

　　10.many city residents complain that it is so few buses in their city that they have to spend much more time waiting for a bus ,which is usually crowded with a large number of passengers.

　　许多市民抱怨城市的公交车太少，以至于他们要花很长时间等一辆公交车，而车上可能已满载乘客。

　　11.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。

　　12.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。

　　13.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 an

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