41.   Two frosted glass doors opened into an elegant lobby.

42.   We were going strong when the bedroom door opened.

43.   We were still waiting for the train doors to open.

44.   When he heard the heavy doors open, the loud voices, he knew what to expect.

45.   When he hears the bedroom door open, Carlos puts his ear up against the front panel.

46.   When I knocked the third time, the door opened of its own accord.

47.   When the door opened a great smell of sweat and leather and stale cigar smoke rushed into the cold night air.

48.   When the lift doors opened she stepped quickly out into the wide service area, and began to run towards the door.

49.   You have to tug a little to break the seal, and then the door opens.