Answer:
I have three eyes and only one leg. Obey me or you will be sorry.
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
I am the type of room you cannot enter or leave. Raise from the ground below I could be poisonous or a delicious treat.
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
What is always coming but never arrives?