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.

Sentence1: Samantha wanted to buy a gift for her boyfriend, Doug. Sentence2: She had a lot of money, but wasn't sure what to buy. Sentence3: Samantha asked Doug's friend for advice. Sentence4: Doug's friend told Samantha that Doug needed a new watch.
Samantha bought Doug a watch, and Doug was happily surprised.