第三部分：语法填空（共两节，满分20分，每小题1分）
根据文段内容或提示，填写正确的单词，每空只能填写一个单词。
A
No one knows exactly 31 the earth began, as it happened so long ago. However, according to a 32 (wide) accepted theory, the universe began 33 a “Big Bang” that threw matter in all directions…..What it was to bee was 34 (certain) until between 4.5 and 3.8 billion years ago 35 the dust settled into a solid globe. The earth became so violent 36 it was not clear whether the shape would last or not…….People are 37 (put) too much carbon dioxide into the atmosphere, which prevents heat from 38 (escape) from the earth into space. As a result of this, many scientists believe the earth may bee too hot to live on. So 39 life will continue on the earth for millions of years to e will depend on whether this problem can be 40 (solve).31-35：how, widely, with, uncertain, when
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(答案→)31-35：how, widely, with, uncertain, when
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