Dear Mr. Smith
I am sorry for what I _________ the other day. My actions _________ extremely childish, disruptive, and disrespectful to you, my peers, and the school.
You can expect better and more appropriate behavior from me in the future. I have learned from this experience and understand that a certain level of refrain and professionalism is _________of me in the classroom.
I recognize your dedication to education and your commitment to instill in me the knowledge I need to succeed. I hope our relationship is undamaged from my actions and that I can continue to learn and grow under your guidance.
Sincerely,
Frank
https://www.english-online.at/travel/747/four-decades-of-the-747.htm
In the text, Frank is