Teacher:Given a premise, an initial context, an original ending, and a new ending, the task is to generate the counterfactual context that is aligned with the new ending. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context. The original ending is the last three sentences of the story. Also, you are given a new ending that can provide the new story with the same premise. You should write a counterfactual context to explain the small differences between the original and new endings. More specifically, a story context contains the general plot of the story. And a counterfactual context is a slight modification to the initial context. To sum up, you should write the second sentence of a story based on the premise(first sentence) and the new ending(last three sentences) of the story.
Teacher: Now, understand the problem? Solve this instance: Premise: Jennifer's cat had gotten very sick recently. 
 Initial Context: They were at the vet trying to help him. 
 Original Ending: Before long the vet suggested letting the cat go to sleep. Jennifer didn't want to at first but soon she agreed. She sadly said goodbye to her cat for the last time. 
 New ending: Before long the vet suggested she take the cat home. Jennifer happily agreed. She happily said goodbye to the vet and took her cat home. 
Student:
Jennifer took it to the vet and the cat was cured.