21.   But efforts to tighten the rules so far have achieved little success.

22.   But Congress and the president have tightened the rules since then.

23.   But Dombeck will also tighten rules governing new roads in those parts of the system where logging roads already exist.

24.   But recently the league tightened some rules, particularly against hand-checking.

25.   But the EPA has tightened rules for drinking water in recent years, leading to pressure on the city to clean up the plants.

26.   But unless the rules are drastically tightened, aggressive campaigns to reach consumers are expected to continue, even though many physicians object.

27.   Clinton favors tightening rules on the tax treatment of real estate investment trusts and annuities, and changing the way multinational corporations are taxed on their sales abroad.

28.   CLINTON CO-SPONSORS PARDON BILL Sen. Hillary Rodham Clinton, D-N.Y., agreed to co-sponsor a bill to tighten the rules on presidential pardons.

29.   Congress made progress Wednesday on a bill to tighten bankruptcy rules, and several other modest measures could make it through the mill in the rush to recess.

30.   Earlier last year it tightened visa rules for Algerians and withdrew French technical and educational staff living in Algeria, many of whom faced death threats from Algerian militants.