阅读下面材料,在空白处填入适当的内容(1个单词)或括号内所给单词的正确形式。
The highest mountain in the world is Qomolangma. It is about 8, 848. 86meters sea level. Many men have tried to climb this mountain without success High winds, cold and little oxygen(氧气)have made this almost impossible thing. It was not until 1953 that two men (stand)on the top of Qomolangma. One of the men (be)Edmund Hillary from New Zealand. The other was Tenzing Norgay of Nepal. They (spend)about sixty days (finish)the whole climbing. The last day, half past eleven they were on the top of Qomolangma. They wanted to stay there for some time, but they couldn't. It was too cold and (danger). They had climbed as (high)as people could climb.