用方框中所给单词的适当形式填空，使短文正确，通顺。（每词限用一次）

                                                                      The population in China
   China has the____ population in the world, and about one ____ of the people in the world live in China. Because of the large____  , there is less____ space for each family. And it's difficult for lots of people____  jobs. The large population also causes many____ difficulties for the whole nation .For example, we're ____ of energy and water. Most cities are ____   than before, ____ the traffic is much heavier .The large population____ a serious problem.

《天上的街市》中，作者借助____，描绘了天街美好的生活图景，表现了对黑暗现实的____，对理想生活的____和对未来的胜利的信心。