Answer:
I am a sharp looking horse with a flaxen tail. The longer I run the shorter my tail becomes.
I'm written with two letters, said with one and seen with two. What am I?
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
From house to house I go, sometimes narrow, sometimes wide. Whether there's rain or snow, I always stay outside. What am I?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.