Answer:
What comes down but never back goes up?
What has one hand longer than the other, and goes on all day and night?
Very helpful if you intend to go gently down a river.
You use it between your head and your toes, the more it works the thinner it grows. What is it?
Some keep it in a dumpster while others keep it in their trunk.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.