Answer:
What is it that given one, you'll have either two or none?
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
What is the word that even in plain sight remains hidden?
What is often returned, but never borrowed?
If you happen to wake up at dawn, you'll probably find this covering the lawn.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.