People live longer in the cities. Medical 1 is better there. And of course, 2 opportunities can be found everywhere in the city. We should continue to develop city services so that people can 3 their lives in the world's urban centers. Rather than limiting development, we should encourage it. Public transportation systems need to be developed so that people can travel to and from work and school easily. Carpooling should be encouraged to cut down on 4 . The more we clean up and 5 our megacities, the more life will improve for the residents of those cities.