51.  Unsightly junkyards full of rusting automobiles already surround every city in the nation.

52.  Once we thought of pollution as meaning simply smog-the choking, stinging, dirty air that hovers over cities.

53.  More and more cities are building sewage-treatment plants.

54.  Where there is a concentration of automobiles, as in our big cities, air pollution is severe.

55.  There would be no way to bring food to the cities.

56.  Some are smaller based on cities, and some are universal.

57.  People around the world may follow some famous beauty contests like Miss World to some city, as a result, they travel around the city to drive the city's economy.

58.  In my opinion, I believe that we had better not love in our university thanks to the fact that a couple would probably split up when they graduate from the university, especially when they are not in the same city.

59.  On the one hand, as information we can get from television or newspapers everyday, lots of big cities just like London, Beijing and New York, are stumped about irritating situation of traffic, so more and more people prefer the bike as a time-saving choice.

60.  These years, more and more beauty contests are being held on TV in many cities all around China.