51.   And the costs are extremely hard to judge.

52.   And the book can feel devilishly hard to review, since ultimately the author seems instead to invite a review of her parents.

53.   As comebacks go, this could be hard to top.

54.   As politicians try to weigh the costs and benefits of opposing the trade pact, public opinion is hard to judge.

55.   As private citizens, however, the cyberdetectives can also be hard to control and monitor.

56.   As with many herbal remedies, the concentration of active ingredients varies as much as fourfold from sample to sample, so dosage would be hard to control.

57.   Assertions that companies exploit the system to pay foreigners less are hard to document.

58.   At times, the ancient cobblestone streets here are so full, it is hard to move.

59.   Bailey was everywhere, charging for rebounds, stepping into passing lanes and going hard to the basket.

60.   Because the body is so small, some folks who like to type with machines on their laps may find it hard to balance.