Answer:
What lies in a tunnel of darkness. That can only attack when pulled back?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
What word is a plural, but when you add an "S" to the end, it becomes singular?
They try to beat me, they try in vain. And when I win, I end the pain.
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?