31.   The elevator door closes before he answers.

32.   The elevator door opened.

33.   The elevator doors open into a kind of reverse aquarium.

34.   The elevator doors opened, and nurses wheeled Sam into a private room.

35.   The elevator doors, one must assume, were more than he expected to encounter.

36.   The elevator doors blew out and flames licked out into the lobby.

37.   The elevator doors opened.

38.   The hotel elevator doors closed and the bearded guy who had just gotten on did a double-take when he saw the teen-age girl standing in the corner.

39.   The force of the impact had dislodged the elevator doors, preventing the elevator from moving, and the doors could not be opened.

40.   The surface can be highly polished, which also makes it useful as an architectural decoration and for things like elevator doors.