题目内容：
根据下列文字，回答题。Until I took Dr Offutt's class in DeMatha High School, I was an underachieving student, but I left that class (31) __________ never to underachieve again. He not onlytaughtme to think, he convinced me, (32)__________ by example as words that it was my moral (33)__________ to do so and to serve others.
(34)__________ of us could know how our relationship would (35) __ over the years. When I came back to DeMatha to teach English, I worked for Dr Offutt, the department chair. My discussions with him were like graduate seminars in adolescent (36) __________, classroom management and school leadership.
After several years, I was (37) __________ department chair, and our relationship (38) __ again. I thought that it might be (39) ___________ chairing the department, since all of my (40)__________English teachers were (41)__________ there, but Dr Offutt supported me(42)__________Fie knew when to give me advice(43)__________ curriculum, texts and personnel, and when to let me (44)__________ my own course.
In 1997, I need his (45) __________ about leaving DeMatha to become principal at another school. (46)__________ he had asked me to stay at DeMatha, I might have. (47)___________, he encouraged me to seize the opportunity.
Five years ago, I became the principal of DeMatha. (48) ___________, Dr Offutt was there for me, letting me know that I could (49) __________ him. I've learned from him that great teachers have an inexhaustible (50)__________ of lessons to teach.回答第31空。 A．concerned
B．worried
C．determined
D．decided
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