完形填空。

　　Some day little cars may take the place of today's cars. If everyone 1 such a little car in the future, there will be less pollution in the air, there will be more parking space in cities, and the streets will be 2 crowded. The space now for one car of the usual size can hold 3 one such little car.

　　The little cars will 4 much less to own and to drive. Driving will be 5 , too, because these little cars can go only 50 kilometres an hour.

　　If we still 8 the big cars along with the small ones, we will need to 9 two kinds of roads. Some roads will be used 10 the big fast cars, and other roads will be needed for the small, slower ones.

　　Some day little cars may take the place of today's cars. If everyone ___(1)___ such a little car in the future, there will be less pollution in the air, there will be more parking space in cities, and the streets will be ___(2)___ crowded. The space now for one car of the usual size can hold ___(3)___ one such little car.

　　The little cars will ___(4)___ much less to own and to drive. Driving will be ___(5)___, too, because these little cars can go only 50 kilometres an hour.

　　If we still ___(8)___ the big cars along with the small ones, we will need to ___(9)___ two kinds of roads. Some roads will be used ___(10)___ the big fast cars, and the other roads will be needed for the small, slower ones.