31.   A study has found that the use of ammonia in cigarettes can dramatically increase the level of nicotine available to smokers.

32.   A. I think you can make your money work harder for you without increasing the level of risk.

33.   Administration officials acknowledged Monday that Abraham had sought to persuade OPEC leaders to maintain or increase production levels.

34.   Burke dealt with this concern by slowly introducing his KGB staffers to the American client and then increasing their level of responsibility and accessibility to corporate secrets.

35.   But effectiveness in suppressing the virus or increasing the level of immune system cells does not necessarily translate into prolonging life or delaying onset of the disease.

36.   But the fact that the missing data included intelligence information increased the level of concern among law enforcement officials.

37.   But the incident increased the level of popular animosity against the army and raised questions, still unanswered, about the competence of the military high command.

38.   But the tide gate also increased salinity levels in the refuge, converting wide swaths of freshwater marsh into salt marsh and killing scores of cypresses and other trees.

39.   By resurrecting review-by-replay a few years ago, the NFL was looking to increase the level of certitude for questionable on-field calls.

40.   Checking on test results, names of the five tabloid paper employees whose tests showed increased levels of antibodies.