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___________(56)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks

The Flying Car

Have you ever dreamed about flying in the sky in your own flying car? It would be wonderful to fly (51)_________. You would not need to spend hours in traffic every day. You could also travel large distances very quickly. Since the Wright brothers built their airplane in 1903, several pioneers have worked to (52)_________a flying car. According to cc industry experts, the dream of flying cars will soon be real. A talented engineer named Paul Moller recently invented such a car. Moller has spent (53)__________40 years and millions of dollars developing his proiotipo The car has (54)_________for four people. It is designed to usce a in small spaces and can fly as high as 10,000 meters. It uses four external engines to move up, down and sideways. The car unfortunately, is not fuel-efficient. It does not get good mileage. Moller s is (55)___________ by computers and satellite systems. (56)________ a crash, it has airbags and parachutes. He showed that a car could be built to fly. 

A flying car society has many problems to (57)________ . The first concerns safety. If there are no roads, what will (58)_________ people from crashing into each other? It is easy for a single car to travel, but what happens when there are thousands? Another issue is (59)__________ . At the moment, it costs several million dollars for one car. How can people afford to buy them? The third issue is fuel. There needs to be enough fuel to supply these cars. The fuel also needs to be less polluting than the kind we use now. Still, technology is advancing. It is (60)_____________ that these problems will be solved in a few years. Then, dreams of quick and easy flight will be realities.

Câu 14081: ___________(56)

A. On top of

B. In addition to

C. In case of

D. When Question 

Câu hỏi : 14081

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