阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
Mr. Smith is forty-eight years old. He began to teach in a middle school twenty-four years ago. He works hard and always comes to his office on time. He expects his students to be honest and is strict with them. Some of his students become famous people, but they still remember him and often write to him. Of course the old man is proud of it.
This term he began to teach Grade One. Some of the new students were told about him, but the others didn’t know him well. He told them how to be an honest person. He gave them several examples and said, “I hate telling a lie most.”
Before class was over, he told all his students to finish Exercise 7 in Unit 1. The next morning, as soon as he came into the classroom, he asked, “Who’s finished Exercise 7?” A few students put up their hands. He shook his head and said, “Open your workbooks and see whether there’s Exercise 7 in Unit 1 or not.”
The students had a look at their workbooks and their faces turned red at once.
21. What is Mr. Green proud of?
A. His students are hard-working. B. His students often write to him.
C. He leaches math very well. D. He is strict with students.
22. Mr. Green told his students ________
A. to study hard B. not to be late for class C. to be brave D. not to tell a lie
23. Why did Mr. Green tell his students to finish Exercise 7 in Unit1?
A. Because he wanted them to do more exercises.
B. Because Exercise 7 was very easy for them.
C. Because he wanted to know if they were honest.
D. Because the students could do it well.
24. The students felt _______ when Mr. Green found them telling a lie.
A. angry B. happy C. sorry D. bored
25. How long has Mr. Green taught in the middle school?
A. For twenty-four years B. For forty-eight years
C. For twenty years D. For thirty-six years
