Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: The kid was writing his Christmas list. A new Nerf gun was at the top of the list. He dreamed of all the fun he could have with his friends. On Christmas morning, it was the first thing he opened. He was so happy!
 selected sentence: He was so happy!

The kid gets a Nerf gun >Causes/Enables> He is so happy