51.   The new technology will make it easier for surgeons to remove abnormal growths before they cause problems.

52.   The new traffic system is causing problems for everyone.

53.   The newer ones, while they do not cause these problems, are prohibitively expensive.

54.   The problem was caused by a fault at an electricity sub-station.

55.   The problem was caused by a worker who inadvertently contaminated the coffee machine by cleaning it with a toxic substance.

56.   The problem was caused by faulty software and was corrected Sunday.

57.   The problem was caused by minute particles of dust getting in the disk drive.

58.   The proposed method of operation for the benefits system will cause enormous problems for families.