41.   External doors should be of robust construction.

42.   The doors here are really something, all made of good wood like mahogany.

43.   This second door is an extra security measure and can be locked in position during the day.

44.   There were two doors leading off the central room.

45.   I turned the handle and found the door was open.

46.   The doors are all watertight.

47.   This door is hard to open.

48.   The door was half open.

49.   This door is the only way out of the room.

50.   Which door is the way in?