三、完形填空：共15小题;每题2分，共30分。通读下面的短文，掌握其大意。然后，从每小题的四个选项中选出可填入相应空白处的最佳选项。

　　In the past，l always thought that being a teacher was an easy job. But I changed my 21 When I became a par-time teacher. About four years ago, Richard asked me 22 could help teach his students how to make a website about themselves. I 23 because computer is what Ido well and ' didn't think teaching computer would be that 24.

　　But when I taught Richard's class, some of the students 25 with their friends while I was explaining how to do something. At first I just got angry with them,26 Richard taught me to think why 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 I didn't 29 his idea. He then asked me if I had ever 30 the same thing.That made me stop. Of course I had!

　　If any of my past teachers are 31 this,I want to say sorry if I sometimes played around in the class 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 be successful.

　　21. A.plan B.mindc. C.hoice D.decision

　　22.A.whether B.why c.where D.when

　　23.A.admitted B.failed C.obeyedg D.agreed

　　24.A.dangerous B.hard C.Interestin D.wise

　　25.A.chatted B.Worked C.performed D.travelled

　　26.A.or B.for C.but D.And

　　27.A.taking B.leaning C.teaching D.preparing

　　28.A.itself B. himself C.them D.me

　　29.A.exchange B.know C.like D.receive

　　30. A.done B.said C.accepted D.thought

　　31. A.saying B.meaning C.writing D.reading

　　32. A.since B.until c.after D. when

　　33.A.worker B.businessman C.student D.engineer

　　33. A.seriously B.importantly C.surprisingly D.probably

　　34. A.All B.Any C.Most D.None