Washington DC is the nation’s capital, and the chance to move there     1     （be）something many Americans look forward to. As a city of rich culture and history, it is an     2     （extreme）exciting place to live in. It is also a perfect destination for a weekend vacation, especially if you love outdoor     3     （activity）, such as jogging and mountain climbing, due to simple weather patterns.

As we     4     （point）out already, there are a number of things     5     （see）in Washington. Whenever you have some free time, there are enough places     6     you can enjoy yourself. From beautiful parks to comfortable environments, museums, cultural shows and lots     7     attractions, there is something for everyone here. Couples love walking along the     8     （variety）streets, thanks to the many romantic spots and things to do here. Moreover, safety is never an issue.

DC has one of     9     safest and cleanest transportation systems in the country. This means that you can choose to use the public means in the District when you do not feel like     10     （drive）around. You can take the subway to whatever destination and still feel safe along with your pet.

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.”