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1. This proverb is saying we have to let things go in their (nature) course. 答案 natural That would be a very (reason) thing to do in a big city，but it could destroy a small village like ours. 解析 考查形容词。此处为a/an＋形容词＋单数名词修饰名词thing当然要用形容词形式。 答案 reasonable He was a billionaire by the time he was 31 years old. ，there are still some other people who have made lots of money at even younger ages. 解析 考查副词。他31岁成了亿万富翁但有些人年龄更小时就发了财。however然而要用逗号与主 答案 However And the passengers (sudden) became friendly to one another. 解析 考查副词。此处是修饰动词became所以应该用副词做状语。 答案 suddenly Finally，that hard work paid off and now the water in the river is (clean) than ever. 解析 考查形容词的比较级。现在河里的水比以前更干净了。根据后面的比较连词than可知这里应该用比较级cleaner。 答案 cleaner That's (absolute) unbelievable. 解析 考查副词。这确实是难以置信的。修饰形容词unbelievable要用副词形式。 | 
