31.   But Congress told the agency to do nothing until the National Academy of Sciences completed a study.

32.   But Boston has a group in Atlanta that already has completed a study of its venues for the athletic events.

33.   But Greenberg defended him Friday, saying Lerman had reduced his involvement in the day-to-day management of the museum long before the study was completed.

34.   But it puts off any decision on whether to raise CAFE standards now, saying the administration will wait for a study to be completed.

35.   But no sooner had these landmark studies been completed than Lipitor emerged as a threatening rival.

36.   But neither knows how many foreign students never show up or overstay their student visas after dropping out or completing their studies.

37.   But no one has yet completed a study of either regimen to test its long-term effectiveness and safety.

38.   But those institutions often direct the patients to other university programs that provide health care to the poor once the study is completed.

39.   But until the study is completed, federal officials say their hands are tied.

40.   Cheney said the administration plans to put off a decision on that question until the National Academy of Sciences completes its study on the issue this summer.