Answer:
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
My teeth help me suck.
What is that you will break even when you name it?
I am a mountain at night, meadow at day. What am I?
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
No matter how little or how much you use me, you change me every month.