摘要：20．--Jack rang you up while you were out．He had something important to tell you． -- ? --No, he’ll call you later．A．Shall I call him back B．Will he call againC．What is it about D．Where is he now(A)Most teachers agree that the first lesson of a teacher is often unforgettable．I remember getting into the class with the 1 of a beginner teacher:nervous, careful, excited-etc．The school 2 my first lesson in was well-known to hold the most troublesomestudents 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 8 that boy untouchable．As soon as I started my lesson writing on the blackboard, I heard some noise from the back．I 9 the students to find out who did it, but the class looked very 10 ．I went on writing and the noise went on．Then l stopped my lesson to 11 this problem because I believed that if I lost controlof the class from the 12 , I wouldn’t be able to get it back．I thought the big boy made the noise．To my 13 , a small boy was the sourceof trouble．Days went 14 and I discovered that the big boy was good and quiet and the great source of trouble came from a group of 15 students who became under control after some weeks．From then on, I realized that judgingby appearance can often be wrong, not only with students．

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