Answer:
I widen my jaws when you poke two fingers in me. I especially like to devour papers
I make a loud noise when changing jacket. I become bigger and delicious.
I can't go left, I can't go right. I am forever stuck in a building over three stories high. What am I?
I am a word. I become longer when the third letter is removed.
Kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all. What am I?
No matter how little or how much you use me, you change me every month.