Beijing, together with Zhangjiakou, succeeded in getting the chance to host the 2022 Winter Olympic Games,     1     speeds up the development of Zhangjiakou City. Word came that the Beijing- Zhangjiakou high-speed railway,     2     (locate) in North China, is now     3     construction, and is expected to be completed by 2020 in preparation for the cities to host the 2022 Winter Olympic Games.

Starting from Beijing North Railway Station and heading west through the Great Wall, the project is     4     (probable) the biggest challenge ever. Its designers say that the explosions needed to dig the tunnels will not have     5     negative effect on the structure.

The railway line has a     6     (long) of 174 km as a double-track passage line, with ten stations along its route. Enjoying a total investment of 31.17 billion yuan, the train will travel at an average of 250 km/h，     7     the trip between the two cities will only take 40 minutes.

According to the plan, the high-speed railway will have two branch     8     (line) —   one is to Yanqing Station, the other is to Taizicheng of Chongli, where the Olyimpic village lies. The full railway,     9     (include) a 70-kilometer section through Beijing,     10     (complete) in four and a half years.