11.The recent rise in crime has aroused(widespread)public concern.

12.The problem of global warming has recently been in the limelight.

13.Many nations have been faced with an acute shortage of trained professionals over the past five years.

14.One of the pressing problems facing our nation(China)today is overcoming disparities in urban and rural income levels.

15.One of the most serious problems many people talk about centers on the lack of adequate housing space.

16.Perhaps the most dangerous phenomenon gripping the nation to-day is official corruption which is pervasive in all levels of government.

17.Inflation is yet another new and bitter truth we must learn to face.

18.China currently faces an acute shortage of doctors. A recent survey showed only one doctor for every5，000 Chinese citizens.

19.An increasing number of unprofitable state-owned enterprises in cities throughout the nation are facing closure.

20.The rapid expansion of urban areas has in many cases encroached on valuable cultivatable land，and led to a general recognition that development must not be carried at the cost of agriculture. The government has attached greater importance to the problem and an increasing number of redundant projects are being terminated.