The more you have of it, the less you see. What is it?
Darkness

What book was once owned by only the wealthy, but now everyone can have it?
You can't buy it in a bookstore or take it from a library.
A telephone book.

What gets whiter the dirtier that it gets?
A chalkboard

What has no beginning, end, or middle?
A doughnut.

What has to be broken before it can be used?
An egg.

What does no man want, yet no man wants to lose?
Work - Employment

How many bricks does it take to complete a building made of brick?
Only one, the last one.

What is everything to someone, and nothing to everyone else?
Your mind.

What goes up and never comes down?
Your age.

What has feet and legs, and nothing else?
Stockings

What grows when it eats, but dies when it drinks?
A candle.