阅读短文，回答问题：The bike-sharing scheme became…

阅读短文，回答问题：The bike-sharing scheme became popular only after ___.

When the city opened its first bike-sharing scheme, few people used it. Bikes were often broken, and there were only twenty stations in the whole city. Things did not improve until the scheme was taken over by a new operator, which repaired the bikes and added more than a hundred new stations. Within a year, the number of daily trips had risen tenfold.