On January 31， a musher named Seppala had to

　　32

　　a frozen body of water called Norton Sound . It was the most

　　33

　　part of the journey. Norton Sound was covered with ice, which could sometimes break up without warning. If that happened, Seppala might fall into the icy water below. He would

　　34

　　, and so would the sick children of Nome. But Seppala made it across.

　　A huge snowstorm hit on February 1. Amusher named Kaasen had to brave this storm. At one point, huge piles of snow blocked his 35

　　. He had to leave the trail (雪橇痕迹)to get around them. Conditions were so bad that it was impossible for him to

　　36

　　the trail again. The only hope was Balto, Kaasen’s lead dog, Balto put his nose to the ground, 37

　　to find the smell of other dogs that had traveled on the trail. If Balto failed, it would mean disaster for Nome. The minutes passed by. Suddenly, Balto began to

　　38

　　. He had found the trail

　　At 5:30 am on February 2, Kaasen and his dog

　　39

　　in Nome. Within minutes, Dr. Welch had the medicine. He quickly gave it to the sick children. All of them recovered.

　　Nome had been

　　40

　　.

　　21. A. examined

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