51.   Meat processors say they have less to do to improve their security because their plants are already closely monitored.

52.   More also must be done to improve teacher quality, he said.

53.   More can also be done to improve the skills of teachers already on the job.

54.   Much has been done to improve living conditions as well.

55.   Not enough has been done to improve security at American embassies and consulates, especially in places like Africa where the threat of terrorist attack was considered low.

56.   Now we will see what he can do to improve it.

57.   Now, of course, there are some things you can do to improve the situation.

58.   Of all the presidents, historians say, only Johnson and Lincoln stand out for what they did to improve the lives of African-Americans.

59.   Q. So if more medical care does not make us healthier, what should we do to improve our health?

60.   Q. What can parents do to improve sex education at school?