Выберите правильную видовременную форму глагола-сказуемого в Active или Passive Simple.

1. Economics, as a social science, (to study) the production, distribution, and consumption of resources.
a. study b. studies c. is studied

2. When you (to compare) the company to others in its industry, make sure you use the same parameters.
a. are comparing b. compared c. compares

3. Last year the government (to buy) shares in various companies considered crucial for its national interests.
a. buys b. bought c. will buy

4. Monetary policy usually (to focus) on keeping inflation low, stable and predictable.
a. is focused b. was focused c. will be focused