1.   The outer door was open this time and a sonorous voice responded to his knock.

2.   The outer doors were as heavy as those in a bank vault and inside the air was clean, dry and quite cold.

3.   They had met at the close mouth as she was inserting her key into the heavy outer door.

4.   I heard the outer door slam, then silence.

5.   Keeping her ears open, she heard the outer door open, then close.

6.   Leith sank down into a chair the moment the outer door had closed behind him and discovered that she was trembling.

7.   Exulting in her escape, she closed the outer door behind her and made for the great outdoors like a child let out of school.

8.   The outer door opened suddenly.