In Japan’s capital city of Tokyo, the height of buildings     1     (limit) because of earthquake danger. As one of the most crowded cities in the world, the traffic in Tokyo has become so heavy that it is very difficult     2     (go)from one place to another. The price of the land, too, has always been going up     3     (rapid). All these explain why a group of Japanese land developers came to     4     conclusion that there was nowhere to go but down. So far they     5     (dig) out space underground for fifteen shopping centers.

One of the     6     (advantage) of shopping and eating underground is its clean air. The city of Tokyo has one of the most serious smog problems in the world. Also, while     7     (travel) underground, you escape the ever-present threat of traffic accidents on the city’s busy streets. Still, the advanced underground traffic system makes it     8     (convenience) for people to get around in Tokyo: you are usually right next to, or even in, a subway station. And you can even spend the night underground     9     you like. The Ginza Station, for example, in downtown Tokyo, has a hotel     10     a bar, restaurant, and barbershop.

High-speed rail     1       (develop) rapidly in China since the mid-2000s. China's high-speed rail accounts     2     two-thirds of the world's total high-speed railway networks. China's rail     3       (ambitious) just keep growing. The latest addition to the country's railway network is a high-speed train line, connecting the cities of Zhangzhou, Xiamen and Fuzhou, all three of     4     are in Fujian Province.

The first train on this line started operating on September 28, 2023,     5     (depart) from Fuzhou, the province's capital. Travel time between Fuzhou and Xiamen,     6     popular tourist destination, will be under an hour. The new railway currently has 84 bridges, 29 tunnels,     7     a section of the track that goes over the sea, making it the     8       (country) first over-water bullet train. Official state news agency Xinhua notes that ground transportation in Fujian Province has been     9     (challenge) due to it mountainous terrain (地形) .     10     (make) the operation of this new line is a significant milestone for the province. China's continuous investments in its railway network will contribute to the country's overall economic growth and development.

China has launched the CR450 science and technology innovation project     1     (develop)an even faster train. According to the national plan, a more advanced bullet train, with a top operating speed of 400 kilometers per hour and an     2     (experiment)speed of up to 450 km per hour, the CR450 would soon be revealed.

By the end of 2022, China’s transportation network     3     (grow)to cover more than 6 million kilometers. From 2018 to 2022, China’s transportation sector (部门)saw investments ofl7 trillion yuan in fixed assets(固定资产), officials said at     4     news conference.

By the end of 2022, China’s railway network had covered 155, 000 km, of which 42, 000 km were high-speed railways,     5     (account)for more than two-thirds of the world’s high-speed railways. In addition, China has developed the world’s     6     (large)road network, which covers 5. 35 million kilometers, of which 177, 000 km are freeways. China,     7     also has 128, 000 km of inland waterways and 21, 000 berths (泊位), can accommodate industrial production.

Fifty-three cities have city metro transportation systems, with     8     (they)operations covering a total of 9, 584 km. Nearly all administrative villages, towns and counties have access     9     hardened roads and bus services. Post     10    (office)are established in all towns.