Answer:
What goes through a door but never goes in and never comes out?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
People need me, yet they give me away every day. What am I?
A large oasis in the desert. Come with cash and leave with none. What am I?
I shave several times a day, yet I still have a beard. What am I?
I tell people to be careful when handling boxes.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic