Answer:
I am a seven letter word. I am very heavy. Take away two letters from me and you will get eight. Take away one letter from me and you will get 80. What word am I?
I sit in a corner while travelling around the world.
I'm a precious stone in a pack of cards. What am I?
What is that you will break even when you name it?
I am a piece of paper that takes most people 3 or 4 years to get. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.