Answer:
I go around in circles, But always straight ahead Never complain, No matter where I am led.
What can be seen but not touched?
What always comes into the house through the keyhole?
I'm a green veggie that looks like a tiny tree.
Tear one off and scratch my head, what once was red is black instead!
What did the piece of wood say when he saw the screwdriver and screws approaching?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?