Write the next sentence in the following story.

A man stands by a pole vault rig while a series of vaulters is shown attempting the vault with varying degrees of success. a group of people wearing white uniforms

[I] walk by in the background.
[II] then show their names and they all demonstrate how to stop from tumbling all over without falling.
[III] watch as another man does a the same thing as the man from the lower right throws a long distance type object, which is immediately hit down and stretched out on concrete ground and has to be pushed across where the vaulters jump in to retrieve the object.
[IV] watching from a small balcony spot when a man falls from the vault and is thrown into a large snow pile.. The answer should be
[I]