Answer:
What is harder to catch the faster you run?
I twist and turn and leave a loop. What am I?
What two keys cannot open any door?
I walk on 4 legs in the morning 2 legs at noon and 3 legs at night.
I have 4 wings but cannot fly. I never laugh and never cry. On the same spot I'm always found toiling away with little sound. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.