Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
People enjoy living in large cities. But cities have problems. One problem is that they frequently grow very rapidly. Transportation ___(1)___ complicated. There are a lot of cars, buses and bicycles. As a result, people are trying to improve the big cities, and they are also planning for new cities. Plan A is a large city ___(2)___ smaller cities around it. There is an open land with trees, fields, and lakes between the large city and smaller cities. Each small city is ___(3)___. It has offices, schools, hospitals, and places of entertainment. In Plan B the cities are ___(4)___ by a road. In Plan C, the cities are in rings around the central city and all of them are connected to each other. The goal of all these plans is to limit the ___(5)___ of the large city.