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 had been raining all evening. Tom and Robert called for a taxi to get back home. They waited nearly one hour for a taxi to arrive. No taxi arrived, and the line for the taxi was quite long. Tom and Robert decided to walk the five miles home.
 selected sentence: They waited nearly one hour for a taxi to arrive.

 Tom and Robert call for a taxi to take them home >Causes/Enables> Tom and Robert wait nearly one hour for the taxi to arrive