选择中有两项为多余项

【题目】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选择中有两项为多余项。

It was graduation day at the university where I work and a beautiful day quite unlike the first graduation I attended as a young professor. On that cold day years ago, as we watched the students walking into the hall, one of my colleagues（同事）turned to me and said, “Graduation will be one of the happiest and one of the saddest time of your life.” At my inquiry, he answered, “  【1】 ”

As years went by, my previous confusion about my colleague's words no longer existed. When I came across naughty students, I have had to rethink why I chose to be a teacher. It obviously isn’t the money. Once a former computer science student of mine called me, asking me if I wanted to have a change.   【2】  His salary was higher than my current（当前的）one, though I have more education and have worked for over a decade. With my programming skills, he said he could get me hired.   【3】

A few days before this current graduation, while working on final grades, I found a note a student had slipped in with her homework. She thanked me for being her teacher and said the things she had learned in my class—not about math, but about life—would be things she would remember long after the math skills had faded away.   【4】

Now, on this sunny graduation day, as I again observed the sea of blue hats and gowns, I did so with renewed dedication（奉献）and a deeper sense of satisfaction—【5】