1.   If anyone did know her secret, that person certainly concealed the fact well.

2.   Only Jasper knew my secret.

3.   Secrecy confers power on those who know the secret while those who do not are at a disadvantage.

4.   He saw a quick glance pass between Joanna and Helen, and wondered if they knew his secret.

5.   He abused my confidence by letting this secret be known.

6.   These secrets are known only to a small group of initiates.

7.   At some dramatic moment in the story, the terrible secret becomes known and a reputation is ruined.

8.   The only other people who knew the secret were Joe and Bob.

9.   Very, very soon the secret of life would be revealed, and Ruth would rather know the secret of death.