VI. Fill each blank with one suitable word.

Today anyone will accept money in exchange …1… goods or services. People use …2… to buy food and books and bicycles and hundreds of …3… things they need or want. When they work, they usually …4… paid in money. Most of the money today is …5… of metal or paper. …6… people used to use all kinds of things …7… money. The people who lived on the shores of the Pacific Ocean …8… shells because they liked them for ornaments. Anyone who had more food than he needed must have been happy to …9… the extra food for shells. Money has an interesting …10… from the days of shell money until today.