21.   The door was open and orchestral music could be heard from a radio somewhere within.

22.   The door was open so he peeked inside.

23.   The door was solid as rock.

24.   The door was unlocked when we arrived.

25.   The door was unlocked, so we opened it and went in.

26.   The door was wide open when we got here.

27.   The end doors are not to be used when the train is in motion.

28.   The first thing to do is make sure the doors themselves are strong enough.

29.   The guards have gone and all the doors are jammed open.