阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
China has changed people's life with its high-speed rail. Chinese people didn’t enjoy (1)______
(them) for traveling tens of hours by train in the past, but their feelings have changed since they got the new high-speed trains. High-speed rail in China is (2)_______ (design) for speeds of 250-350km per (3)______.
Compared with ordinary trains, the high-speed trains are (4)______ (smart) and more energy-efficient, with more space inside. They are completely researched and developed (5)______ Chinese people. High-speed rail is developing (6)_____ (rapid) in China. Now China has the(7) _ (long )high-speed rail network in the world. In recent years, China has successfully(8)_______ (export) high-speed rail technology to many (9)_______ (country). The Chinese are (10)______ (pride)of China’s high-speed rail.