阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。
On a hot summer day in America, a little boy decided to go for a swim in the old swimming hole behind his house. He dived into the cool water, Not 1that as he swam towards the middle of the lake, a crocodile (鳄鱼) was swimming toward him.
His mother2was looking out of the window and saw the two as they got closer and closer. In great3she ran toward the water,4 to her son as loudly as she could. Hearing her voice, the little boy became 5 and made a U-turn to swim to his mother.6 it was too late. Just as he reached her, the 7reached him. From the shore, the mother 8 her little boy by the arms just as the crocodile snatched his legs. That began an incredible tug-of-war (拔河) between the 9The crocodile was much 10 than the mother, but the mother wouldn't11A farmer 12to drive by, heard their screams, raced from his truck, took aim and13 the crocodile.
14 after weeks and weeks in the hospital, the little boy survived. His 15were extremely scarred (留下疤痕) by the attack of the animal. And, on his arms, were deep scratches (抓痕) where his mother's fingernails dug into his flesh in her effort to hang on to the son she loved.
The newspaper reporter, who 16the boy, asked if he would show him his scars. The boy lifted his legs. And then, with obvious 17 he said to the reporter, “But look at my arms. I have great scars on my arms, too. I have them 18my Mom wouldn't let go.”
Never judge another person's19, because you don't know 20 they were made.
