21.   I arrived a few minutes early, and found the main door locked.

22.   I can only get in when he forgets to lock the door.

23.   I have kicked myself every day since then for not checking again to see that the doors were locked.

24.   I locked the door and took the phone off the hook so no one could disturb me.

25.   I locked the door and turned out the lights.

26.   I make sure that my car doors are locked.

27.   I pat my trouser pockets for the keys to the car, find them, and begin to lock the doors.

28.   I thought the door was locked.

29.   I went to my room and locked the door and ... I jumped into bed and pulled the duvet right over me.

30.   If the room has to be unattended, lock the door.