Fleming was a poor Scottish farmer．One day while working in a field，he heard a cry for help．He immediately（16）___ （throw） his tools away．Following the sound，Fleming came to a deep bog（沼泽），in which a boy was screaming and sinking．Fleming tied a rope around（17）___ own waist and the other end（18）___ a tree，and walked into the bog．With great effort he pulled himself and the boy to （19）___（safe）．He quickly took the boy to his farmhouse，（20）___ Mrs．Fleming fed him，dried his clothes，and sent him home．
The next day a carriage arrived．A well-dressed man stepped out，（21）___ （say） he was the father of the boy．"You saved my son's life．"said the man．"（22）___ can I repay you？"
"I don't want payment．"Fleming replied，"Anyone would have done the same．"
Just then，Fleming's son appeared at the door．
"Is he your son？"the man asked．"Yes．"said Fleming（23）___ （happy）．
"I have an idea．Let me pay for his education．If he's like his father，he'll grow to be a man we'll both be proud of．"
And so he did．Thus（24）___ farmer's son attended the best schools，graduated from a medical college，and became the world-famous Nobel prize-winning scientist and discoverer of penicillin，Sir Alexander Fleming．
It's said（25）___ many years later the man saved from the bog caught pneumonia（肺炎）．
Penicillin saved h is life His name？Sir Winston Churchill．
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