Answer:
Used left or right I get to travel over cobblestone or gravel. Used up I vie for sweet success used down I cause men great duress.
I am what no man ever yet did see, which never was, but always is to be. What am I?
What comes in many different sizes but is always only 1 foot long?
You cannot keep me until you have given me. What am I?
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?