21.  Ms. Jones and the White House have powerful reasons to reach a settlement, White House officials and friends of Ms. Jones have said.

22.  That proved a powerful reason to smoke.

23.  That is indeed a risk, but there are powerful reasons to discount it.

24.  The detectives did not need a spot of blood on the Bronco to have powerful reasons to question Simpson.

25.  The Republican leadership in Congress and Clinton have powerful reasons to find some accommodation this year and enact legislation on Social Security and dividing up the surplus.

26.  The speed-of-change argument seems a powerful reason for the government to be circumspect in pursuing antitrust cases in high-tech fields.

27.  There are powerful reasons for construing constitutional silence on this profoundly important issue as equivalent to an express prohibition.

28.  There are powerful reasons to be alarmed about the impact of family breakups on children, and about the high incidence of poverty in single-parent households.

29.  There may be powerful social reasons for this program.

30.  There is a powerful evolutionary reason behind the way humans store fat.