Answer:
What can be as big as an elephant but weighs nothing?
Squeeze me and I cry tears as red as flesh, but my heart is made of stone. What am I?
The person who makes me doesn't need me. The person who buys me doesn't use me. The person who uses me doesn't know it. What am I?
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
What force and strength cannot get through I with my unique teeth can do.
What did the piece of wood say when he saw the screwdriver and screws approaching?