31.   The selective pressure is on all hosts to keep changing the password.

32.   The selective pressure is on all pathogens to mimic the passwords of their hosts.

33.   The survey suggests that all of this competitive fervor is taking a toll, and that financial pressures are paramount.

34.   There is considerable pressure to use these waters for recreation, and they receive much disturbance.

35.   There is extreme pressure for production and keeping costs down.

36.   There is increased pressure on Congress to backtrack on some of the welfare cuts imposed last year.

37.   There is no pressure to adopt the business model of reporting.

38.   There is pressure on the country to reduce its rice imports.