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.

[Q]: Sentence1: John had worked hard on his homework but couldn't find it anywhere. Sentence2: Then he came upon some paper scraps on the floor. Sentence3: His dog, Betty, was sitting nearby with a paper scrap in her mouth. Sentence4: John was worried his teacher would think he was lying.
(A) John turned his homework in the next day. (B) John didn't know what to do.
[A]: B

[Q]: Sentence1: Rob has never been on a rollercoaster. Sentence2: Rob's friends offered him a free ticket to six flags. Sentence3: Rob decided he may as well join. Sentence4: They all went and waited a long line.
(A) Rob had generous friends. (B) Rob's friends were thoughtless.
[A]: A

[Q]: Sentence1: Lexi wanted to be healthy. Sentence2: But she wanted hot cocoa. Sentence3: So she decided not to add any sugar. Sentence4: The hot cocoa tasted boring.
(A) Being healthy isn't always fun. (B) She loved the donut she was eating.
[A]:
A