41.   DNA testing is the key that can unlock the door to the truth in many of the toughest cases before our courts.

42.   Finally, the American Center for History unlocks the door as three of us wait outside.

43.   He found the door unlocked, and inside he found Ms. Clarke and her son.

44.   He edges behind a beam to a wire cage and unlocks the door.

45.   He unlocked the door.

46.   He unlocked the doors, displaying a cascade of thin blue and yellow wires.

47.   I leave the office a little later than usual and unlock the door to a quiet house.

48.   I want to tell him to march up to that shop, unlock the door, switch on the lights.

49.   If the door has glass panels an intruder can easily break the glass, reach in and unlock the door.

50.   If we ignored his call to unlock the door, he stationed himself on the bedroom windowsill and began an obnoxiously loud lament that always woke the neighbor.