Answer:
When it comes to me, you go on red and stop on green. What am I?
Every night I'm told what to do, and each morning I do what I'm told. But I still don't escape your scold. What am I?
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
I am easy to waste. I am unstoppable. What am I?
I am flora, not fauna. I am foliage, not trees. I am shrubbery, not grass. What am I?
What made Cyclops quit teaching?