Read the definitions carefully and select the correct words.
1. something that helps you to be more successful than others, or the state of having this
2. something you can choose to do or use instead of something else
3. a person, event, or thing that makes something happen
4. the way in which two facts, ideas, events etc are related to each other, and one is affected or caused by the other
5. something that causes problems, or that makes someone or something less likely to be successful or effective
6. a feeling of being not sure whether something is true or right
7. knowledge or skill that you gain from doing a job or activity, or the process of doing this
8. to go down to a lower level, amount, price etc
9. a situation in which something is necessary, especially something that is not happening yet or is not yet available
10. the situation or experience of being poor
11. the belief that something or someone is important and should not be harmed, treated rudely etc
12. to increase in number, amount, or value