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”.
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
What is eaten but can also eat?
I have a brother. However much we run we do not reach each other.
I walk on 4 legs in the morning, 2 legs at noon, and 3 legs at night. What am I?
When is it bad luck to see a black cat?