Answer:
I run around the streets all day. Under the bed or by the door I sit at night, never alone. My tongue hangs out, waiting to be fed during the day. What am I?
I am a cave full of bones and the house of a worm.
What can travel all around the world without leaving its corner?
I shrink smaller every time I take a bath.
I am the reaction after enjoying soda.
No matter how little or how much you use me, you change me every month.