通读下面短文，掌握其大意，然后从短文后各题所给的四个选项中选择能填入相应空白处的最佳选项。

Most teachers agree that the first lesson of a teacher is often unforgettable. I remember getting into theclass with the     1    of a beginner teacher: nervous, careful, excited... The school I     2    my first lesson in was well-known to hold the most troublesome (顽皮的) students in the city. With this in    3   , I was more nervous than I should be. But I tried my best not to     4    it out and went into the class. The first thing I did was taking a look at the whole class. My eyes     5    on a big black student. He was sitting in the back     6     of the class with no one in front of him. His body was much    7    than mine. I thought it would be better to leave that boy untouchable. As soon as I started my lesson writing on the blackboard, I heard some noise from the back. I     8   the students to find out who did it, but the class looked very    9    . I went on writing and the noise went on. Then I stopped my lesson to solve this problem because I believed that if I lost control (控制) of the class from the    10     I wouldn't be able to get it back. I thought the big boy made the noise. To my   11    , a small boy was the source (根源) of trouble. Days went     12     and I discovered that the big boy was good and quiet and the great source of trouble came from a group of small-sized students who became under control after some weeks. From then on, I realized that judging (判断) by appearance can often be wrong, not only with students!

(    )1. A. ideas     (    )2. A. started    (    )3. A. head     (    )4. A. make     (    )5. A. stopped   (    )6. A. line     (    )7. A. higher    (    )8. A. faced     (    )9. A. common    (    )10. A. beginning   (    )11. A. competition (    )12. A. out

B. feelings      B. found       B. mind         B. bring       B. caught       B. row         B. lighter     B. wondered      B. angry        B. example     B. congratulation B. down

C. thoughts   C. opened     C. school     C. work      C. pointed    C. room      C. larger     C. discussed   C. quiet      C. matter     C. surprise    C. away

D. ways        D. finished       D. hand        D. show           D. warned      D. part           D. thicker       D. described  D. crowded       D. end         D. difference  D. on