Dear Keystone,
I am very glad to participate in this school and graduate there. I love learning from Keystone and the teachers are really nice. I would love to recommend other students to this school. English is my favorite subject so far and I love how Keystone makes me smarter and smarter everyday. Thank you so much for providing this wonderfully made school for the students who love to learn.
Best regards,
(name)
urging the audience not to generalize all teens based on a few bad drivers.
"All of a sudden..." is a transition that shows suspense. It says something happened, but it didn't happen with any warning and it doesn't tell the reader up front what went on or if it was good or bad.
Encouraging people to eat healthier or to watch what they eat.