Answer:
I am what remains when nothing is left.What am I?
Autumn leaves and bad bowlers wreak havoc on this
What has three ways out and just one way in?
What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?
A hill full, a hole full, yet you cannot catch a bowl full.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.