For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context. Until I took Dr. Offutt’s class, I was an underachieving student. But I left that class 50 _never to underachieve again. He not only taught me to think, he convinced me, as much by examples as words, that it was my  _51   obligation to do so and to serve others. Neither of us could know how our relationship would 52 over the years. When I first came back to DeMatha to teach English, I worked for Dr. Offutt, the department chair. My discussions with him as he mentored me were like graduate seminars in adolescent (青少年)  53    , classroom management and school leadership. After several years, I was   54     department chair, and our relationship shifted again. I thought that it might be 55 to chair the department, since all of my former English teachers were 56 there, but Dr. Offutt supported me  57    . He knew when to give me advice about curriculum, texts and personnel, and when to let me 58 my own course. In 1997, I needed his  59 about leaving DeMatha to become principal at another school.  60     he had asked me to stay at DeMatha, I might have.   61    , he encouraged me to seize the new opportunity. Five years ago, I became the principal of DeMatha. 62 , Dr. Offutt was there for me, letting me know that I could 63 him as I tried to fill such big shoes. I’ve learned from him that great teachers have an inexhaustible wealth of lessons to teach. Even if his students don’t know it yet, I know how 64 they are: I’m still one of them. 50. A. anxious             B. eager                  C. determined         D. worried 51. A. family              B. legal          C. academic           D. moral 52. A. evolve              B. stay          C. remain              D. worsen 53. A. process            B. procedure     C. development        D. movement 54. A. called               B. appointed      C. entitled           D. offered 55. A. awkward           B. uneasy         C. unnatural          D. insensitive 56. A. once               B. already        C. still               D. never 57. A. through            B. throughout     C. at the beginning      D. in the end 58. A. chart             B. head           C. describe           D. manage 59. A. opinion            B. request         C. permission         D. promise 60. A. Even if             B. Although        C. If                  D. When 61. A. Naturally           B. Instead        C. Consequently        D. Peacefully 62. A. Once again         B. Now and then  C. Hopefully                       D. Surprisingly 63. A. count on           B. account for      C. call on              D. appeal to 64. A. earnest           B. worried         C. fortunate           D. desperate