Answer:
We are little airy creatures all of different voice and features one of us in glass is set. One of us you'll find in jet. Another you may see in tin. And the fourth a box within. If the fifth you should pursue it can never fly from you.
Cold head and feet; round as a ball; always turning around myself.
Everyone has me except for a few. You may not be able to identify me but I can always identify you. What am I?
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen. What am I?
What is always coming but never arrives?
Why did the teacher have to wear sunglasses?