In ancient times, _______ was really important in a civilization's development. People grew a _______ of food, and this extra food helped towns grow and become a _______ where people traded things, sometimes using a _______ system. They used paths or networks for this trading called _______. To help the city economically, _______ was enforced on the people as a way to fund the government and public services. For a growing economy, there was a need for _______, to keep track of trade, taxation and other economic activities, to ensure stability and societal order. Having a skilled _______, like people who were good at making things, were also important for a strong civilization.