单词释义：根据英语解释写出相对应的单词或短语。
1. something that happens, especially something important, interesting or unusual ______
2. a water way dug out of the ground to connect two areas of water ______
3. gas that hot water gives out ______
4. all the people in a country ______
5. many; a lot of ______
6. a sudden event such as a flood, storm, or accident that causes great damage or suffering ______
7. to put somebody or something under the earth, often in order to hide him or it ______
8. to save someone or something from a situation of danger or harm ______
9. a special wall built across a river to stop the water from flowing ______
10. someone who works underground in a mine ______
