题目内容：
根据下面资料，回答题 In the past, I always thought that being a teacher was an easy job．But I changed my 21 whenI became a part-time teacher．About four years ago, Richard asked me 22 I could help teach hisstudents how to make a website about themselves．
I 23 because computer is what I do well and I didn' t think teaching computer would bethat 24 ．
But when I taught Richard' s class, some of the students 25 with their friends while I wasexplaining how to do something．At first I just got angry with them,___26__ Richard taught me to thinkwhy they were doing this．He said that if he was 27 a lesson and the students were not listening,then he was angry with 28 for not making the lesson clear or interesting for them．I told him that Ididn' t 29 his idea．He then asked me if I had ever 30 the same thing．That made me stop．Ofcourse I had!
If any of my past teachers are 31 this, I want to say sorry if I sometimes played around in theclass 32 you were teaching．I didn' t think how that would make you feel．I promise I will do my
best to be a good 33 in the future．Please help us when we don' t understand and most 34 ,don't be quick to be angry when we fail． 35 of us are perfect but with your help we can besuccessful．
第（21）题答案 A．plan
B．decision
C．choice
D．mind
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