he handed the medicine to the next musher，Shannons face was black from the extreme cold.

　　On January 31, a musher named Seppala had to

　　__12__

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

　　__13__

　　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

　　__14__，and so would the sick children of

　　Nome.But

　　Seppala made it across.

　　A huge snowstorm hit on February 1.A musher

　　named Kaasen had to brave this storm.At one point，huge piles of snow blocked his __15__．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 __16__ the trail again.The only hope was Balto，Kaasens lead dog.Balto put his nose to the ground，__17__

　　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

　　__18__．He had found the trail.

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

　　__19__

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

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