Answer:
I am heavy forward, but backward I'm not. What am I?
Everyone in the world needs me. They generously give me but never take me. What am I?
I have a small hill with seven holes. What am I?
I am what brings things together. Without me everything you see would be a total mass or debris everywhere. What am I?
I am heavy forward but backward I am not. What am I?
What made Cyclops quit teaching?