1 . Wilbur and Orille Wright are brothers famous for inventing the first aeroplane. Their interest in flight     1     (start) on the day when their father brought home a toy helicopter for them. It was made of paper and wood. The boys played with it until it broke, and then made their own     2     (replace) it. When they were older, they owned a bicycle shop where they started producing and selling their own bikes. This provided them with the money to pay for their experiments in flight. Eventually, they built their     3     (fly) machine.

2 . The Darjeeling Himalayan Railway may be the slowest train in the world. Every day the train     1     (climb) over 2250 meters. Although the entire trip is 80 kilometers, it takes up to ten hours. The railway     2     (build) in 1881 and has been carefully protected for its cultural importance. Today the train is attractive to the passengers who come from other places     3     (see) the railway and the surrounding mountains. They seem to get a lot of pleasure     4     its slow speed. For     5     (fan) of this train, being slow is actually a good thing. As these people say, “slow” has four letters, so has life; “speed” has five letters, so has death.

Beijing was once a city of bikes, the capital of a country    1    (know) as the Bicycle Kingdom, where cars were reserved for official and political business.    2    , decades of remarkable economic growth 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    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 modern 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.”