Logic Riddles

Question: What goes around comes around?

Question: There was once three trees. The first tree did whatever the third tree did, and the third tree did what ever the second one does. What happens if tree number two gets cut down?

Question: If you're in 3rd place and you passed the person in 2nd, what place are you in?

Question: Flies hate us with a passion, who are we?

Question: A smart landscaper is given the task of placing 4 trees so that they are all the same distant away from each other.

How does he do this?