All residents of the kingdom were having a good time at the ball

Мальчик радовался, когда он подарил девушка хрустальные туфельки

A tertiary audience member could be any number of unanticipated persons or a group of people (especially outsiders) who gain access to a document you have prepared for another person. 

For workplace writing, tone is 

Sanya killed a criminal 

Cover letters should be written with a future focus on the employer and position, not with your own interests at the forefront. What can you do for your future employer? How can your skills benefit a company or organization if you are hired? 

He broke the law and committed crimes

In a perfect world, you would have complete mastery over your basic writing skills.  However, a realistic goal is to write well enough so that you will neither distract readers with errors nor attract the average educated reader’s negative critical attention.  

You should list every job you have ever held on a resume.

If you regularly communicate in certain dialects, forms of English considered “non-standard,” or different languages altogether (ex. Southern dialect,  Ebonics,  Spanglish, or generational slang, for example), you will likely benefit from learning how to code-switch, which is