11.   She has theoretical knowledge of teaching, but no practical experience.

12.   She has vast knowledge of treating sports injuries.

13.   Sometimes we need to employ contractors because they have specialist knowledge.

14.   The book assumes that you already have some knowledge of physics.

15.   The creditor had no knowledge of what had passed between debtor and sureties.

16.   The referees must have personal knowledge of the applicant and consider that he or she supports the aims of the Society.

17.   The State Department said it had no knowledge of any threats to U.S. security.

18.   These groups have apparently been isolated from other humans for long periods of time and have no knowledge of the modern world.