题目内容：

Beijing was once a city of bikes, the capital of a country 1. (know) as the Bicycle Kingdom, where cars were reserved for official business and the politically powerful. 2., decades of remarkable economic growth led to a huge flowing of can in the city. Owning one became not just a marker of reaching the middle class but also a 3. (require) for marriage. As the economy boomed, autos pushed bikes off the roads, 4. (create) heavy pollution and miserable traffic.

Fortunately now Beijing may be returning to its roots with a modem twist. Thanks to about 20 technology companies, brightly coloured shared bikes 5. (flood) Beijing since last year. Many local residents welcome the shared bikes 6. the flexibility and freedom they offer. They pick up the bikes and then ride and drop 7. off anywhere they like, locking the back wheel, with no need to find a fixed place.

Analysis in China say there are three factors 8. contribute to the sudden increase of bikes: a lot of cash looking for a home, a good idea and government support. “As the city’s population grew, traffic jams got 9. (bad).” Cai, the Ofo spokeswoman, said, “Shared bikes could solve the ‘last mile’ problem in 10. environmentally friendly way.”