Answer:
I am easy to waste and unstoppable. What am I?
I know a word of letters three. Add two and fewer there will be. What is the word?
When you take away the whole from me there is always some left.
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
Good memory, skin like the sea. A great beast I am, yet vermin frightens me. What am I?
Do what he says and you'll be fine, don't and you lose the game.