问题详情：
Flying cars may soon become a 61 (real). The rideshare service Uber has asked 62 expert from NASA, the American space agency, 63 (help) the company develop cars that can fly.
Uber plans to use flying vehicles 64 the future to avoid traffic in and around cities. The company wants to use small, totally electric aircraft, 65 could take off and land like a helicopter on top of parking garages. Uber said its flying vehicles would be much 66 (quiet), cost less to operate and produce less pollution than helicopters.
One person in San Francisco 67 (write) on Twitter, “I used to think that flying cars was a ridiculous idea. 68 I changed my mind this morning when I sat in a heavy traffic.” Another person added from Mumbai, India: “I’m reading about Uber 69 (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 70 (they) but with human pilots within one to three years.
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