Now cities are full of cars.Some families even have two or

Now cities are full of cars.Some families even have two or three cars.Parking is a great problem.Something will have to be done to change it.What will the cars of tomorrow be like?Little cars may some day take the place of today's big cars.If everyone drives little cars in the future there will be less pollution in the air.There will also be more space for parking cars in cities,and the streets will be less crowded .Three little cars can fit（适合）in the space now needed for one car of the usual size.The little cars will cost much less to own and to drive.Driving will be safe,too.What is more,these little cars can go about 65 kilometers per hour（每小时）.Little cars of the future will be fine for going around a city,but they will not be useful for long trips.If big cars are still used along with the little ones,two sets of roads will be needed in the future.Some roads will be used for the fast big cars ,and other roads will be needed for the slow little ones.
___is the big problem for those people who have cars.
A.Money B.Parking C.Driver
Cars in the future mustn't bring ____ pollution in the air
A.more B.much C.less
The little car's size may be ___ today's car's size
A.one third of B.two thirds of C.as big as 
People can ___ money by using the little cars
A.spend B .cost C.save
The big cars are ___ the little cars for long trips
A.as useful as B.not so useful C.more useful than

___is the big problem for those people who have cars.
B.Parking
Cars in the future mustn't bring ____ pollution in the air
A.more
The little car's size may be ___ today's car's size.
A.one third
People can ___ money by using the little cars.
C.save
The big cars are ___ the little cars for long trips
C.more useful than