What is the simple word to apologize to the leader?

1, Dear Leader: Hello! First of all, please accept my sincere apology. In fact, I have always respected you for several years. You are my leader and my tutor in teaching and scientific research. I am very grateful to you.

2./kloc-since June of 0/4, something unpleasant has happened in my business study. I have been in a bad mood these days and I am always troubled by my own impulses. Later, Director Zeng and President Xu talked to me successively. Although they all comforted me not to take it to heart, not to have ideological burden, and to pay attention to the way of communication with leaders, I still felt that I was in my back, and the teachers' surprised and curious "greetings" and eyes made me very uncomfortable. As the saying goes, impulse is the devil. I am tired of being angry when I am impulsive, and I regret and blame myself after I am impulsive. This lesson is really hard to forget. With the spread of knowledge, I became the laughing stock of others after dinner, and I really regret it.