题目内容

根据句意及首字母的提示,补全单词
1. One of the most dangerous sports in the world is mountain c_________.
2. There were no man-made s_________ as big as the Great Wall.
3. The train was traveling at an ordinary s_________.
4. F_________ is one of the biggest problems in the world.
5. It's dangerous to climb the highest mountain because thick clouds c_________ the top of the mountain.
1. climbing   2. structures   3. speed   4. Flooding   5. cover
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