完形填空。 I ever had my best lesson years ago. In my class, Mark talked all the time. I had to tell him again and again that 1 in class was not right. Every time he said sincerely, 'Thank you for correcting me, Madam.' I didn't know what to do, but soon I 2 to hearing it many times a day. Like Mark, the other students were noisy. One afternoon, when everyone was having 3 with a math problem, some students started to fight. I had to do something, so I asked each student to get out thirty-four small pieces of paper. I told them 4 they should write the name of a 5 on each piece and, under that, say something nice about the person. At the end of class I 6 the papers. At the beginning of the next day I gave them out to the students. Everyone smiled. Their classmates had said such 7 things about them! The exercise had achieved its aim. The students were happy with themselves and one another again. Many years 8 , Mark's father called to tell me Mark was killed in the war and asked me to his funeral (葬礼) the next day. At the funeral Mark's father came up to me and took out some papers. 9 looking at the papers, I knew they were the 10 on which Mark's classmates had listed all the nice things about him. (     )1. A. telling (     )2. A. used (     )3. A. difficulty (     )4. A. that (     )5. A. teacher (     )6. A. invented (     )7. A. nice (     )8. A. ago (     )9. A. Because (     )10. A. one B. talking B. got used B. difficult B.what B. classmate B. discovered B. bad B. later B. Don't B. it C. speaking C. liked C. different C. if C. parents C.established C. interesting C. before C. Without C. those D. saying D. enjoyed D. difference D. why D. people D. collected D. terrible D. after D. No D. ones