Answer:
You heard me before, yet you hear me again, then I die. Until you call me again.
What is seen in the middle of March and April that can’t be seen at the beginning or end of either month?
who do you think you know but sometimes you don't
What binds two people yet touches only one?
Walk on the living, they don’t even mumble, Walk on the dead, they mutter and grumble. What are they?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.