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.successful →successfully
网友回答
(答案→)successful →successfully
解析：本文叙述了美国的探险家Byrd在飞过了北极之后的三年，又成功了飞过了南极，他们在飞越南极时由于Byrd的果断，扔掉了一些装食物的袋子，飞机脱险了。
【小题1】考查副词。successful 是形容词；successfully是副词，来修饰动词。
【小题2】考查副词。therefore表示因此，后接结果；though尽管，引导的是让步状语从句。
【小题3】考查固定短语。a great many许多，用来修饰可数名词的复数，是固定短语。
【小题4】考查动词。laid是lay的过去式“放”；lay是“lie”的过去式，“位于”。
【小题5】考查固定短语。Run into trouble遇到麻烦，是固定短语。
【小题6】考查副词。sure用于人做主语，这里是it seemed certain that…似乎确定了。
【小题7】考查动词。raised是“提高”是及物动词，rose是不及物动词，这里没有宾语。
【小题8】考查动词。因为主语是no more mountains 是复数故用were.
【小题9】考查固定短语。in sight在视野内，是固定短语。
【小题10】考查名词。difficult是形容词；difficulty是名词，放在介词之后应该用名词。