Riddles

Riddles?

hi blog,today i am back from the holidays and today i brought some riddles with me.comment down below your answers and i will reply.

1.I can’t be seen, found, heard or smelled. I lie behind stars and under hills, I fill empty holes, come first and follow after. What am I?

2.Joe's father had 3 sons...snap,crackle and?

3.What room do ghost avoid?

4.How do you know that carrots are good for your eyes