Which phrase, if any, can be deleted from sentence 15 without changing the meaning of the sentence?

Alberto wrote this essay about a memorable teacher. He would like you to read his paper and look for corrections and improvements he should make.  (1) I had the same teacher for both third and 4th grades, which were difficult years for me. (2) My teacher and I did not get along, and I don’t think she liked me. (3) Every day, I thought she was treating me unfairly and being mean. (4) Because I felt that way, I think I acted out and stopped doing my work. (5) In the middle of fourth grade, my family moved to a new town, and I had Mr. Shanbourne as my new teacher. (6) From the very first day... Show more

Alberto wrote this essay about a memorable teacher. He would like you to read his paper and look for corrections and improvements he should make. 

(1) I had the same teacher for both third and 4th grades, which were difficult years for me. (2) My teacher and I did not get along, and I don’t think she liked me. (3) Every day, I thought she was treating me unfairly and being mean. (4) Because I felt that way, I think I acted out and stopped doing my work. (5) In the middle of fourth grade, my family moved to a new town, and I had Mr. Shanbourne as my new teacher.
(6) From the very first day in Mr. Shanbourne’s class, I was on guard. (7) I was expecting to hate my teacher and for him to hate me back when I started his class. (8) Mr. Shanbourne took me by surprise right away when he asked me if I wanted to stand up and introduce myself. (9) I said no, probably in a surly voice, and he just nodded and began teaching the first lesson of the day.
(10) I wasn’t sure how to take this. (11) My old teacher forced me to do things and gave me detention if I didn’t. (12) She loved detention and gave it to me for anything I did—talking back, working too loudly, forgetting an assignment. (13) Mr. Shanbourne obviously didn’t believe in detention, and I tried him! (14) During my first two weeks at my new school I did my best to get in trouble. (15) I zoned out in class, turned work in late, talked out in class, and handed in assignments after the due date. (16) Mr. Shanbourne just nodded.
(17) Mr. Shanbourne asked me to stay in during recess. (18) This is it, I thought. I was going to get in trouble, get the detention my ten-year-old self had practically been begging for. (19) After all of the other kids ran outside, I walked up to Mr. Shanbourne’s desk.
(20) “How are you doing, Alberto,” he said.
(21) I mumbled something.
(22) He told me he was disappointed in my behavior over the last two weeks. (23) I had expected this and just took it. (24) The detention was coming any second. (25) Than Mr. Shanbourne took me by surprise. (26) He told me that even though he didn’t know me very well, he believed I could be a hard worker and that I could be successful in his class. (27) He asked me how he could help me listen better and turn my work in on time.
(28) I told him I had to think about it and rushed out to recess. (29) Even though my answer seemed rude, I was stunned. (30) I hadn’t had a teacher in years who seemed to care about me, and said he believed in my abilities.
(31) To be honest, my behavior did not improve right away and I still turned in many of my assignments late. (32) But over the last few months of fourth grade, things changed. (33) Mr. Shanbourne continued to believe in me, encuorage me, and help me, and I responded by doing my best. (34) I had a different teacher for fifth grade, but whenever I was struggling I walked down to Mr. Shanbourne’s classroom to get his advice. (35) I’ll never forget how Mr. Shanbourne helped me, and I hope he’ll never forget me either.

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