Answer:
I help engines spin and pants stay up
I am an insect. Half of my name is another insect. I am similar to the name of a famous band. What am I?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
Why did the teacher have to wear sunglasses?