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: It was a slow day at the library. A librarian tried to pass the time by reading. She started to read a page when she heard a noise. It was a person banging on the front door. The person shouted that the door was locked and he wanted to come in.
 selected sentence: A librarian tried to pass the time by reading.

It is a slow day at the library >Causes/Enables> A librarian tries to pass time by reading