With the development of agriculture and industry, more and more people are pouring into big cities, _____ causes so much trouble. _____ the growth of the population, city problems are g _____. To begin with, big cities are becoming so _____(拥挤)that is makes finding a job difficult. People without a job probably become a d _____to our society. In addition, the environment is getting w _____, and there are traffic problems and pollution problems as _____. We have to face them. Big cities need to control the population to h _____develop _____ (自己) for the future. As for protecting the environment, I think every _____(市民)should contribute to protecting the environment. |