31.   The walls of these are thick with blood vessels which absorb gaseous oxygen.

32.   The walls were a lovely reddish-brown color.

33.   The walls were all dirty and the furniture was falling to pieces.

34.   The walls were all rough.

35.   The walls were beige up to about waist level, then turned off-white.

36.   The walls were black with grime.

37.   The walls were black with mould.

38.   The walls were dark gray and bare, but Horton speckled and painted the floors of the auditorium aisles with free-form designs.

39.   The walls were mostly slate, apparently quite normal, grained rock produced by a perfectly standard physical process of alluvial deposition.

40.   The walls were thick with ivy.