What Am I Riddles

Question: I am a cave full of bones,
and the house of a worm.

What am I?

Question: No matter how hard you try,
I can open what you can't.
If it wasn't for me,
on your front porch you would stand.

What am I?

Question: I fall while I'm flying, but can't touch the ground. I'm beaten all day, yet don't make a sound. I try to leave when you keep hitting me, but you always manage to somehow get me. No matter what I do, I always find my way back to you. What could I possibly be?

Question: Some people peel my skin some people don't, you eat me nevertheless, with or without, what am I?

Question: I live off of a busy street,
if you want you can stay for an hour or two,
but if you don't pay rent I'll tell on you.

What am I?