根据短文内容和所给中文提示，写出空白处各单词的正确形式。每空限填一词。

    More people like living in a city now, especially young people who like new and modern things. Most people think it is much （容易）to find work in a city. They think there are a lot of （有乐趣的）things to do and places to see in the city. There are also many （选择）of public transport. When they feel tired, they can eat in good restaurants, visit museums, go to cinemas and go to（自然）parks .

    （然而）, in my opinion, living in the city will cost more. What's more, The （人口）of the city is getting bigger and bigger. So it's a  （遗憾）that the city is always（拥挤的）, noisy and dirty. And it is very difficult to find a good place where people can enjoy （和平）and fresh air. So we should try hard  （改善）the serious situation.