根据句意及首字母或汉语提示，写出各句中所缺单词的正确形式。（每空一词，共10分）
【小题1】As you go up a mountain, you have to overe the earth’s ggravity which pulls you down.
【小题2】The mmaple leaf has bee the most important symbol of Canada since the national flag was introduced in 1965.
【小题3】The little girl was tterrified at the thought of being left alone at home and cried.
【小题4】He went to the United States in the 1980s and ssettled down there.
【小题5】Don’t leave matches or cigarettes on the table wwithin reach of little children.
【小题6】How quickly a fuel burns depends on how well it is mixed with oxygen (氧气) or air.
【小题7】The policemen were sent to find the black box because it showed why the plane hadcrashed
(坠毁).
【小题8】The idea exists (存在) only in the minds of us young people today.
【小题9】This problem is only slightly (稍微) difficult so I can work out.
【小题10】They claimed that when they were surrounded (包围) by the gang they acted in self-defense.
网友回答
解析：
【小题1】 gravity 名词地球引力gravity，该词的使用范围不广，通常和名词earth连用，在上下文中很容易就可以判断出具体用法。
【小题2】 maple 根据下文的symbol of Canada可知是指加拿大的枫叶，maple leaf枫叶。
【小题3】 terrified 形容词感到害怕的terrified。是由动词terrify转换而成。
【小题4】settled 动词短语定居settle down。注意一词多义现象，settle还可以表示姐居然。
【小题5】within 固定搭配within the reach of在…的范围之内。
【小题6】 oxygen 名词氧气oxygen,该词属于专有名词，根据上下文很容易就可以判断。
【小题7】 crashed 动词坠毁crash,根据句意说明使用过去完成时，故使用过去分词的形式。
【小题8】 exists 动词存在exist因为后面的时间状语是today，故使用一般现在时。
【小题9】slightly 副词稍微slightly做状语修饰形容词difficult。
【小题10】surrounded 动词包围surround，本句使用被动语态的形式，故使用过去分词的形式。