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.
Input: Sentence1: Lisa was having a birthday. Sentence2: Her friends secretly decided to have a surprise party. Sentence3: When Lisa walked in the room, she was shocked. Sentence4: She couldn't believe they did that.

Lisa was thankful.