Detailed Instructions: In this task, you're given four sentences of a story written in natural language in which one part is missing. Your job is to predict the position and missing part of the story and return in the following format: position, missing part. The missing part is a sentence that completes the story, and the position is the number of the missing sentence in the new story.
Problem:Sentence1: Mark had a big interview for a new job. Sentence2: The interviewer seemed to be impressed with Mark's answers. Sentence3: The interviewer informed Mark he had the job. Sentence4: Mark was very happy.
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
2, He prepared himself for the questions they may ask.