Answer:
I am an odd number. Take away a letter and I become even. What number am I?
I fly forever Rest never.
You kick me, you punch me, and you beat me up all class. When you leave, you don't even say thanks for allowing you to beat me up. What am I?
Sing me to a baby about to go to sleep.
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.