Answer:
What has a bell but isn't a church. Is full of air but is not a balloon?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
What can you share and still have all for yourself?
It happens when something has been cut with H2O.
When is it bad luck to see a black cat?