Answer:
The classification of the severity of an accident (as fatal, serious or slight) is determined by the severity of the injury to the most severely injured casualty.
In my opinion:
-Use clear and concise words
-Don't make the sentences too long
-If you want to list info put it in bullet points
-Don't use bombastic words
The text:
__________
"Then he began teaching at Pinkerton Academy."
__________
is NOT a "run-on" or "sentence fragment"; rather, it is a complete sentence.
"You would not walk away while someone was talking without saying anything..." matches to 'to present a similar situation that logically proves the point'
"This habit is hurting relationships and shortening attention spans" matches to 'to state an overall thesis governing what is argued in the essay'
and finally, "Without eye contact, it is nearly impossible to be fully engaged in the conversation." matches up with 'to explain why attention to one's phone can hurt relationships'