Mark was walking home from school one day when he saw the boy in front of him fall down and drop all the books he was carrying,along with two sweaters,a basketball and a walkman. Mark stopped and helped the boy pick up the things. Since they were going the same way,Mark helped to carry some of the things. As they walked,Mark knew that the boy's name was Bill,and he loved computer games,basketball and history. He was having lots of troubles with his lessons,and he had just broken up with his girlfriend.

They arrived at Bill's home first and Mark was served with some coke and was invited to watch television. The afternoon passed happily with a few laughs and some small talk,then Mark went home. They often saw each other at school from then on,had lunch together once or twice _? and then they both finished middle school. They entered the same high school where they sometimes met and talked with each other over the years. At last,just three weeks before they finished high school,Bill asked Mark to have a long talk together.

Bill asked Mark if he still remembered the day years ago when they first met. "Did you ever think why I was carrying so many things home that day?" asked Bill. "You see,I emptied my locker because I didn't want to leave anything for anyone else. I had kept some of my mother's sleeping pills and I was going home to kill myself. But after we spent the time together talking and laughing,I began to understand that if I killed myself,I would have missed that wonderful time and so many others that might follow. So you see,Mark,when you picked up those books that day,you did a lot more. You saved my life."

(   ) 11. Bill carried so many things home because .

   A. Mark would like to help him

   B. he just finished high school

   C. he wanted to leave this world

   D. his girlfriend asked him to do so

(   ) 12. We know from the reading .

   A. Bill was not good enough with computer games

   B. Mark was one of Bill's classmates

   C. Bill and Mark became friends after they first met

   D. Mark was in a higher grade in the school

(   ) 13. Mark went to Bill's home that day         .

   A. before he went home himself

   B. to help him with his lessons

   C. while watching TV for some time

   D. to find out what troubles Bill had

(   ) 14. We can infer that         .

   A. Bill and his girlfriend made peace with each other

   B. Mark and Bill went to the same college

   C. Bill's mother had trouble with her sleep

   D. Mark knew he had saved Bill's life first

(   ) 15. The underlined sentence "so many others that might follow" in the reading means

   A. so many pleasant things that might happen to him

   B. so many sad students who might do what he did

   C. so many clever boys who might follow him home

   D. so many beautiful girls who might refuse him,too