Answer:
I am a certain five-letter word and become shorter when you add two letters to me. What am I?
I am a king who's good at measuring stuff.
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
They took me from my mother's side where I was bravely bred and when to age I did become they did cut off my head. They gave to me some diet drink that often made me mad but it made peace between two kings and made two lovers glad.
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.