Mark was walking home from school one day when he noticed the boy ahead of him had tripped(绊倒) and dropped all his books. Mark 21 and helped the boy pick up the scattered articles. Then as they walked along together, Mark discovered the boy’s name was Bill, that he loved video games, baseball and history, 22 he was having lots of trouble with his other subjects. He also learned that he had just 23 with his girlfriend. They arrived at Bill’s home first and Mark was 24 in for a Coke and to watch some television. The afternoon passed pleasantly. They then became good friends and later entered the same senior high school where they had brief contacts over the years. Finally the long awaited senior year came and three weeks 25 graduation, Bill asked Mark if they could talk. Bill 26 him of the day years ago when they had first met. “Did you ever wonder why I was carrying so many things home that day?” asked Bill. “You see, I cleaned out my locker because I didn’t want to leave a 27 for anyone else. I had stored away some of my mother’s sleeping 2 8 .But after we spent some time together talking and laughing, I 29 that if I had killed myself, I would have 30 that time and so many others that might follow. So you see, Mark, when you picked up those books that day, you picked up my life as well.” 21. A. sat down    B. lay down      C. knelt down    D. slowed down 22. A. and         B. but           C. but hat       D. and that 23. A. fallen in love               B. broken up     C. got along well  D. done away 24. A. invited     B. allowed       C. stopped       D. interested 25. A. after       B. from          C. before        D. since 26. A. asked       B. informed      C. remembered    D. reminded 27. A. note        B. message       C. sign          D. mess 28. A. medicine    B. pilled        C. bags          D. clothes 29. A. wondered    B. doubted       C. realized      D. forgot 30. A. missed      B. lost          C. seized        D. spent