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: I asked my girlfriend if we can visit my friend. Sentence2: Since she thought that I knew about her birthday, she said yes. Sentence3: When we got inside of the place, my friend's brother called us. Sentence4: He told us to hide.

SOLUTION: When my friend came, he surprised him for his birthday party.

PROBLEM: Sentence1: Kia loved to take walks. Sentence2: She would walk for hours at at time. Sentence3: One time Kia ran into a stray dog. Sentence4: The dog didn't seem to be very friendly.

SOLUTION: Kia remained calm and got away from the dog safely.

PROBLEM: Sentence1: Dee found a pink piece of paper tucked under her windshield wiper. Sentence2: It was a flyer for a concert taking place later that night. Sentence3: Dee's boyfriend had just cancelled their date, so she decided to go. Sentence4: At the concert, she was surprised when her boyfriend got on stage.

SOLUTION:
He proposed to Dee, telling her that he had left the flyer on her car.