21.  And it is that middle-class base that has long been eroding in Chicago, as in many American cities.

22.  And he is only visiting one American city instead of several.

23.  And many have come, demographers and sociologists say, because of a yearning for a sense of community that has vanished from many American cities.

24.  And it is central to the experience of the American city.

25.  And, as in most large American cities, the killing of teen-agers and children is commonplace.

26.  As far as American cities go, Philadelphia is well past middle age.

27.  As American cities continue to recover from their long period of decay and demoralization, a new group is hoping to accelerate the comeback.

28.  As in so many American cities, the elevated highway overnight changed the look and feel of Miami.

29.  As cultural exchanges with the United States grew, he took his orchestra to New York, Los Angeles, Chicago and other American cities.

30.  As in other major American cities, the levels of crime are falling in Washington.