Answer:
You bury me when Iām alive and dig me up when Iām dead. What am I?
I run cold and hot, I look blue but am red. What am I?
What dress does everyone have, but no one wears?
Taken from a mine and then locked up in a wooden case. I am used by students everyday.
What is black when you buy it, red when you use it, and gray when you throw it away?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.