You explain one or more than one topic the prompt tells you to write about.
History is by far my favorite subject in school. It is challenging learning new information. So, the challenge is well worth it for several reasons. First, it's great to learn about inspirational figures from the past. Today we learned about Abraham Lincoln, who guided America through the Civil War. Second, I get to see how the past has influenced our lives today. Therefore history helps us all learn to not make the same mistakes that were made in the past. Lastly history helps us grow and learn. There are just three of the reasons I can't wait for for history class.
I think it's the first one. Throughout the story we see Becky struggling with the idea that she might fail this time. Really she is making the possible outcome seem worse than it actually is (the outcome being that she could fail the test again), and Justin helps her calm down and realize that it really isn't that big of a deal if she doesn't pass.
that this is the affect of tone, and mood in this passage.