21.   The steel doors slam shut behind the four girls as they walk down a seemingly endless hallway beneath the watchful eye of guards.

22.   The weighty rattle of the starting gate as the doors slam shut behind the last horse to line up.

23.   The truck rolled slowly past a cyclone fence topped with barbed wire, through a metal gate that slammed shut behind it.

24.   There were the guards who crammed the victims into the gas chambers and screwed the airtight doors shut behind them.

25.   Then they stepped through the metal detectors and sliding doors on their first day, and heard the locks click shut behind them.

26.   You did not walk through the door of NATO to see it shut behind you.

27.   At first, the women pounded on the heavy, iron doors that shut behind them.

28.   I heard the door slam shut behind me.

29.   Local television showed the iron gates sliding shut behind him.

30.   When the steel doors clang shut behind them, a door at the front of the chamber opens and a prison administrator appears.