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 ______