Beijing was once a city of bikes，known as the Bicycle Kingdom，【小题1】cars were reserved for official business and the politically powerful. However，decades of economic 【小题2】（grow）led to a huge flowing of cars in the city. Owning one became not just a marker of reaching the middle class but also a requirement for marriage. As the economy developed，autos pushed bikes off the roads，【小题3】（create）heavy pollution and miserable traffic.

【小题4】（fortunate），now Beijing may be returning to its roots. Thanks to about 20 technology companies，brightly colored shared bikes 【小题5】（flood）into Beijing in the last two years. Many local residents welcome the shared bikes 【小题6】the flexibility and freedom they offer. They pick up the bikes and then ride and drop 【小题7】off anywhere they like，locking the back wheel，with no need 【小题8】（find）a fixed place.

Analyses in China say it is three factors that contribute to bikes' increasing rapidly: a lot of cash looking for a home, a good idea and government support. "As the city's population grew, traffic jams got 【小题9】 (bad). "Cai, the ofo spokeswoman, said, "Shared bikes could solve the' last mile' problem in 【小题10】environmentally friendly way."