Answer:
I wiggle and cannot see; sometimes underground and sometimes on a tree. I really don't want to be on a hook and I become a person when combined with “book”.
You heard me before and then again. Afterward I die, until you call me again. What am I?
I'm blue, but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt, but I'm good for you. What am I?
I have a foot but no leg. What am I?
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
Brings the sky a lot closer.