11.  A few other fossil species of Rhus are known from the Tertiary rocks.

12.  A fundamental distinction exists between knowing a fact and understanding it.

13.  A glance at the assembled guests told him what he already knew - that no one looked quite as good as he did.

14.  A good estate agent will know the best ways to publicize the fact that your home is for sale.

15.  A good example is the construction of teeth, about which a certain amount is known.

16.  A good manager knows when to delegate.

17.  A good reporter will pursue a story until he or she knows all the facts.

18.  A good stringer will know the right string and tension for you.

19.  A good teacher knows how to maintain discipline.

20.  A good travel agent knows that a satisfied customer will always come back.