完形填空： Walking home from school one day.Mark noticed a boy ah

完形填空： Walking home from school one day.Mark noticed a boy ahead of(1)____tripped anddropped some things.Mark came up to himand helped him(2)____them up.Since they were going the same way,he helped to carry some things.(3)____they walked,Mark knew that the boy's name was Bill and that he was getting into some trouble. After(4)____to Bill's home,they began to talk.The afternoon passed(5)____with a few laughs.Soon they became good(6)____.Laterthey often met each other at school,and had lunch together.At last,they went to the same junior high school.(7)____graduation,Bill asked Mark to have a talk with him. "Do you ever wonder why I was(8)____so many things home years ago?"asked Bill. "Yes."Mark nodded. "In fact,I was going home (9)____myself.But after talking with you,I realized that if I had killed myself,I wouldn't have(10)____so many kind-hearted men.So you see,Mark,when you picked up my books that day,you did a lot more.You saved my life."