Part 1. Definition
In this task, you're given four sentences of a story written in natural language. The given story is not complete and your job is to complete the story by selecting one of the sentence choices from (A) and (B), such that the story sounds fully coherent.
Part 2. 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: The incident caused him to turn a new leaf. 
 (A) He is happy now. (B) He joined a gang.
Answer: A
Explanation: As mentioned in fourth sentence, the incident turned a new leaf to Rick's life; so, he must be happy now.
Part 3. Exercise
Sentence1: After school, Alex went to his friend's house to play video games. Sentence2: Alex didn't have any video games himself so he was excited. Sentence3: Alex always loses when playing against his friend. Sentence4: However, he didn't care because Alex always has fun. 
 (A) Alex hates playing video games. (B) Alex likes playing video games.
Answer:
B