Употребите в предложениях форму причастие 1 или 2.
1. Currency is a particular type of money (using/used) in a state.
2. The (purchasing/purchased) power of dollar is falling in the world market.
3. We found the first series of experiments (completed/completing).

1. Currency is a particular type of money (used) in a state. 2. The (purchasing) power of dollar is falling in the world market. 3. We found the first series of experiments (completed).