51.   The first is the number of relationships and the second is their quality.

52.   The second was that the economists were complacent about the problem.

53.   The second was the rhythm of the war itself, which gave time for the detailed discussion of post-war policy.

54.   The second is a tendency for subjects to recall central details of risky situations at the expense of peripheral details.

55.   The second is that the research is part of the total scientific oeuvre, and thus has a wider value.

56.   The second was a letter to everyone who had volunteered, thanking them for offering to come, and saying when to turn up and what to bring.

57.   Why is the first sentence of grammatical while the second is not?

58.   The second is that teaching on the subject in engineering courses has not always prepared engineers adequately for this progression.

59.   The second was a heart shot, but it turned on the breastbone.

60.   The second is that the CBD stricture is always distal allowing for the use of comparatively short mesh stents.