1 . 阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写1个恰当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。
The race to the South Pole was on! Amundsen was the first 1 (leave) , on 8 September 1911. He had teams of dogs pulling the sledges and all his men were on skis. Because of this, he made rapid progress. Scott left on I November and soon had problems. First, his two sledges broke down, and then the houses began to have serious 2 (difficult) with the snow and the cold. After a while, Scott and his men had to push the sledges 3 (they) .
