TASK DEFINITION: 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: He watched several documentaries about Einstein. Sentence2: Then, he read a book on the Theory of Relativity. Sentence3: Joe learned quite a lot about Einstein's scientific achievements. Sentence4: He could not wait for his advanced physics class to start.

SOLUTION: 1, Joe was interested in Einstein's General Theory of Relativity.

PROBLEM: Sentence1: Arnold bought a new television. Sentence2: After a couple of weeks it stopped working. Sentence3: He tried to return it but had lost his receipt. Sentence4: Arnold was not allowed to return the television.

SOLUTION: 2, He paid cash.

PROBLEM: Sentence1: They both needed to use the school library books about dolphins. Sentence2: But Mary had beaten Gina and taken them all. Sentence3: And now she refused to share the books. Sentence4: Gina's mother had to call Mary's mom to complain.

SOLUTION:
1, Gina's friend Mary wouldn't share.