Most of Russian people live in urban areas.
Big cities are attractive because of their great size and developed industry. They are great cultural and political centres. People can visit museums, theatres, excursions, art galleries and get perfect education. In big cities people live in comfortable flats. Big cities also have disadvantages. Lots of people, cars, factories pollute the atmosphere. People's lives are shorter.
Discovered, invented, to discover, discovery, invention, an inventor.