61.   But some food safety experts have wondered how best to do that without raising levels of chemicals known as amines that have been linked to cancer in animals.

62.   But more recent cases, linked to a day-care center and two restaurants, have raised the level of concern.

63.   But she raised the level of her play against top-echelon players.

64.   But that will only happen if the Nets are able to significantly raise their level of play.

65.   But they stress that chlorine levels were quickly raised and are maintained by equipment that continuously monitors and adjusts the levels of the bacteria-killing chemical.

66.   But tougher standards requiring schools to raise performance levels, endorsed by both candidates, could pass.

67.   But to prevent a problem, the fluid level was raised.

68.   But when the Celtics needed to raise the level of their play with the game on the line in the fourth quarter Saturdaynight, they did.

69.   But there were questions about his ability to survive against speedier attackers and to raise the level of play of his teammates.

70.   But, as Iverson pointed out, there are many scientists and satellites keeping an eye on the vast Antarctic ice shelves and their potential to raise ocean levels.