51.   Burton could not help laughing about his assignment.

52.   But it will probably be quite some time before many passengers of British Airways can laugh about their experiences on the airline in late October and early November.

53.   But I am still laughing about Monday.

54.   But laughing about one invites serious discussion about the other.

55.   But in real life, no one is laughing about these odd occurrences, even though they still read like a curse.

56.   But later, Wiebe had nothing to laugh about.

57.   But Stuper seems able to laugh about it.

58.   But the former congressman from Kansas said the budget impasse between the administration and congressional Republicans is nothing to laugh about.

59.   But she can laugh about it, too.

60.   But the rowers laugh about their personal troubles.