短文改错（共10小题；毎小题1分，满分10分）
下面短文有10处语言错误，请在有错误的地方增加、删除或修改某个单词。
增加：在缺词处加一个漏字符号（＾）.并在其下面写出该加的词。
删除：把多余的词用斜线(\)划掉，
修改：在错的词下划一横线，在该行右边横线上写出改正后的词。
注意：1.每处错误及其修改均仅限一词.
2.只允许修改10处，多者（从第11处起）不计分
In 1929, three years after his flight over the North Pole, the American explorer, R.E. Byrd, successful flew over the South Pole for the first time. Therefore, at first, Byrd and his men were able to take great many photographs of the mountains that laid below, they soon ran into serious troubles. At one point, it seemed sure that their plane would crash. It could only get over the mountains if it raised to 10,000 feet. Byrd at once ordered his men to throw away two heavy food sacks. The plane was then able to rise and it cleared the mountains by 400 feet. Byrd then knew that he would be able to reach the South Pole which was 300 miles away, for there was no more mountains at sight. The aircraft was able to fly over the endless white plains without difficult.