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 drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
Where did the baseball keep its lemonade?
I start with T end with T and within me is T.
What is always coming but never arrives?