根据下面资料，回答21-35题

In the past, I always thought that being a teacher was an easy job. But I changed my(21)when I became a part-time teacher. About four years ago, Richard asked me(22)I could help teach his students 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 1 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 lis-tening, 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 l 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.

第(31)题选