______ FURTHER RIOTING TO OCCUR, THE GOVERNMENT WOULD BE FORCED TO...

10. ______ further rioting to occur, the government would be forced to use its emergency powers.

A. Should

B. Did

C. Were

D. Had

1

2

3

4

5

6

7

8

9

10

II. Read the following text and fill in each numbered blank with the appropriate form of the words in

brackets. Write your answer in the space provided.

Today’s cars are smaller, safer, cleaner, and more economical than their predecessors, but the

car of the future will be far more pollution-free than those on the road today. Several new types of automobile

engines have already been developed to run on (1)______ (alternate) sources of power, such as electricity,

(2)______(compress) natural gas, methanol, steam, hydrogen, and propane. Electricity, however, is the only

zero-emission option presently available.

Although electric vehicles will not be (3)______(true) practical until a powerful, compact battery or

other (4)______(depend) source of current is available, transport experts foresee a new (5)______(

assort) of

electric vehicles entering everyday life: shorter-range commuter electric cars, (6)______(three-wheel)

neighborhood cars, electric delivery vans, bikes and trolleys. As automakers work to develop practical

electrical vehicles, urban planners and utility engineers are focusing on (7)______(structure) systems to support

and make the best use of the new cars. Public charging facilities will need to be as common as today’s gas

stations. Public parking spots on the street or in commercial lots will need to be equipped with devices that allow

drivers to charge their batteries while they stop, dine, or attend a concert. To encourage the use of electric

vehicles, the most convenient parking in (8)______(transport) centers might be reserved for electric cars.

Planners foresee electric shuttle buses, trains, buses and neighborhood vehicles all meeting at

transit centers that would have facilities for charging and renting. Commuters will be able to rent a

(9)______(vary) of electric cars to suit their needs: light trucks, one-person three-wheelers, small cars, or electric/

gasoline hybrid cars for longer trips, which will no doubt take place on (10)______(automate) freeways capable of

handling five times the number of vehicles that can be carried by freeway today.