31.   The cat is a good mouse catcher.

32.   Some cats are clever enough to figure out how to operate doorknobs.

33.   Our cats are similar in size.

34.   The cat was naturally curious about its new surroundings.

35.   Most cats are solitary creatures.

36.   A dozen stray cats were asleep under a Con Edison awning and so were two winos.

37.   When the cat was successful it was rewarded with food and then placed back inside the box.

38.   Cats were a lot brighter.

39.   Should cats be doing it at all, should any animal be made to do those sort of tricks?

40.   Now cats are pretty independent creatures.