1. This proverb is saying we have to let things go in their (nature) course.
答案 natural
2. That would be a very ，but it could destroy a small village like ours.(reason) thing to do in a big city
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
