Answer:
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
What has one head one foot and four legs?
What is seen in the middle of March and April that cannot be seen at the beginning or end of either month?
The more you work the more I'll eat.You keep me full I'll keep you neat.
I am a fruit with seed on the outside. What am I?
When is it bad luck to see a black cat?