Read the definitions carefully and select the correct words.
1. used to tell someone to think about what they are doing so that something bad does not happen
2. the quality of being very careful to avoid danger or risks
3. a substance used in chemistry or produced by a chemical process
4. to protect a person, place, or object by staying near them and watching them
5. used to warn someone to be careful because they might hurt themselves or someone else, or damage something
6. a deep hole or holes in the ground that people dig so that they can remove coal, gold, tin etc
7. someone who is in a position of authority in an organization
8. if you are required to do or have something, a law or rule says you must do it or have it
9. the state of being safe and protected from danger or harm
10. things that are done to keep a person, building, or country safe from danger or crime
11. to tell someone that something bad or dangerous may happen, so that they can avoid it or prevent it
12. something, especially a statement, that tells you that something bad, dangerous, or annoying might happen so that you can be ready or avoid it
13. used to tell someone to be careful