Answer:
What happens once in June twice in August and never in May?
What can be drawn but never taken?
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
There is one in a minute two in a moment and none in a thousand years. What is it?
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.