题目内容：

Flying cars may soon become a 1.    (real). The rideshare service Uber has asked 2. expert from NASA, the American space agency, 3.    (help) the company develop cars that can fly.

Uber plans to use flying vehicles 4. the future to avoid traffic in and around cities. The company wants to use small, totally electric aircraft, 5. could take off and land like a helicopter on top of parking garages. Uber said its flying vehicles would be much 6. (quiet), cost less to operate and produce less pollution than helicopters.

One person in San Francisco 7. (write) on Twitter, “I used to think that flying cars was a ridiculous idea. 8. I changed my mind this morning when I sat in a heavy traffic.” Another person added from Mumbai, India: “I’m reading about Uber 9. (hire) a NASA engineer to build flying cars, while Fm stuck in traffic. There is hope.”

The expert predicts there will be several early models of cars that can’t fly 10. (they) but with human pilots within one to three years.