Exchange rates

These words appeared in the reading text "Exchange rates". Choose the correct word from the list for each definitions.
1. to increase the value of a currency in an otherwise fixed system -
2. to decrease the value of a currency in an otherwise fixed system -
3. adjective describing a rate that changes or varies -
4. people who argue in favour of something -
5. to fall in value in a market system -
6. to rise in value in a market system -
7. to attempt to protect oneself against future price changes -
8. continuous changes in a price or value -
9. agreements to buy something at a fixed price several months ahead -
10. the quality of being exchangeable (especially the ability to convert a currency into gold or other currencies without restriction) -
11. equality between prices of commodities or securities in two separate markets -
12. investment involving high risk but also the possibility of high profits -