TASK DEFINITION: In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.
PROBLEM: Sentence1: Nelly the cashier was having a bad day at the store. Sentence2: She kept making small mistakes and people were getting mad. Sentence3: Even her last customer was mad and it wasn't even her fault. Sentence4: As soon as it was time for her break she dashed outside.

SOLUTION: The fresh air was exactly what Nelly needed to clear her head.

PROBLEM: Sentence1: Tommy trained hard to run his first 5K. Sentence2: During the race he felt frustrated when so many people passed him. Sentence3: When he heard his name called during awards he was shocked. Sentence4: He didn't realize they would do awards by age group.

SOLUTION: He was proud to finish first by age but tenth overall.

PROBLEM: Sentence1: Lily was looking forward to her birthday - she always had a big party. Sentence2: But her best friend wasn't mentioning any plans. Sentence3: On her birthday, she still hadn't heard anything about a celebration. Sentence4: Lily was very disappointed when she walked into her dark living room.

SOLUTION:
Her mood changed quickly when her friends jumped out to surprise her.