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.
One example: Sentence1: Rick grew up in a troubled household. Sentence2: He never found good support in family, and turned to gangs. Sentence3: It wasn't long before Rick got shot in a robbery. Sentence4: He is happy now.
Solution is here: 4, The incident caused him to turn a new leaf.
Explanation: As mentioned in fourth sentence, he is happy now; so, the incident turned a new leaf to Rick's life.

Now, solve this: Sentence1: John had worked hard on his homework but couldn't find it anywhere. Sentence2: Then he came upon some paper scraps on the floor. Sentence3: John was worried his teacher would think he was lying. Sentence4: John didn't know what to do.
Solution:
3, His dog, Betty, was sitting nearby with a paper scrap in her mouth.