Hey student!

Thank you for your generous words. I'm happy to answer any questions you might have. =)

To answer your question, yes...you can think of formality when considering the tone of a passage. Remember to avoid answers that are too informal - these answers are too casual and often use vague/general words like "things, stuff, all of that, etc...". Also, don't choose answers that are too formal. These are answers that sound too scientific, and they often use overly sophisticated language that tries to make the writer appear smarter than he actually is. Instead, you want to choose answers that have the appropriate level of formality. Often, these answers will be written in a straightforward way that is clear and easy to understand. =)

Hope this helps! Keep moving forward!