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短文填空。
根据下面短文内容，在短文的空格处填上一个恰当的单词，使短文完整、通顺。
Have you ever heard someone say “It's raining cats and dogs”? We know it doesn't mean cats and dogs fall down from the sky．In 1 , it means it's raining heavily．Here is 2 people get the saying．
Long long ago, there were many large rats(老鼠) in a country．The rats were a big problem to the country, so people there needed 3 to help them very much．But there were many mountains in the country．It was difficult 4 a plane to land．What should they do? At last, they had a good idea-the cats came down by parachute(直升机)．
In another country, it often 5 ．And in the bad weather people sometimes got 6 and couldn't find their homes．Some even died．So they needed dogs to 7 them to find the lost people in the snow．But there were many forests(森林) in the country．The trains couldn't get there．The buses weren't 8 to get there, either．How could they get dogs? You can guess it．The dogs came down by parachute, too．
So now you can see, people get the saying “It's raining cats and dogs” in this unusual way．
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