21.   But it is a warning that running a city school has become less attractive.

22.   But many U.N. officials spend a large part of their careers at the headquarters here, where city neighborhood schools may have problems and private education is expensive.

23.   But surveys and focus groups show quite clearly that African-Americans want out of the decrepit and unsafe city schools.

24.   But the improvement did not include significant narrowing of the gap between city schools and their wealthier neighbors.

25.   But the mayor could lighten the burden by pressing city schools to better prepare the students it sends to CUNY.

26.   But that yearlong survey also found that one out of four city schools had seriously deteriorated roofs or exterior walls, and two out of five had deteriorated windows.

27.   But the real cause seems to be a turf battle between the Power Authority and the School Construction Authority, which builds and repairs city schools.

28.   City schools were to be closed Friday and thousands of federal workers were given the day off.

29.   Costikyan said the hearings would try to define the crime problem in city schools, examine how the division is run and consider how it should be changed.

30.   Crew seemed to change his view after a recent Stancik report arguing that gang activity had increased in the city schools.