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: When it was 3 o'clock, I went outside. The mailman reached in front of my house. He had a very big package. When I opened it, I was shocked. It was a birthday present for me.
 selected sentence: When I opened it, I was shocked.

I get a package >Causes/Enables> I open the package