21.   But lawyers for co-ops and condominiums and representatives of multifamily property owners now say that compliance will be difficult in many situations and virtually impossible in others.

22.   But sleep was impossible in the stifling rooms.

23.   But that could prove politically impossible in Washington, where Congress balked two years ago at approving a bailout of Mexico.

24.   But that is often impossible in the Third World, where well-trained doctors are scarce.

25.   But visionary themes are impossible in a divided government committed to the notion that the federal role in resolving national social problems is limited.

26.   Congestion has gotten so bad, truckers say, that finding a place to park is almost impossible in many states.

27.   Dislodging permit holders, however, has been next to impossible in the past.

28.   Distinguishing a Serb from anyone else by sight is nearly impossible in Bosnia.

29.   Educators say individual instruction is virtually impossible in such classes.

30.   Even so, Oancea said he had managed some political cheekiness that would have been impossible in the old days.