Answer:
I am an odd number. Take away one letter and I become even. What number am I?
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What am I?
What is so delicate that saying its name breaks it?
I hide in a dark tunnel awaiting my time. I can only be released by pulling back. Once released I may do unstoppable damage.
Written on with words of white, Has the color of the night, Is the teacher's best delight, And a student's daily fright