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,答案写在答题卡上。

During the past three decades,China【小题1】 (witness)the railway industry’s transformation from making slow trains 【小题2】 making domestically manufactured high-speed trains

In 1997,China started 【小题3】 (it)first significant railway speed increase. Since then, the country’s high-speed rail technology has continued to achieve breakthroughs250 km/h to 350 km/h and then to 400 km/h.Made-in-China high-speed trains not only operate 【小题4】 (smooth) in freezing weather and desert【小题5】 (region),but they also come with driverless technology Millions of railway workers take pride in their roles as the company provides【小题6】 clear route for their professional advancement.Through【小题7】 (train), practical operation and assessment, they can move up as a wiring worker to a technician, an operator an expert and even a scientist

As trains become faster and more intelligent, their software and hardware systems will become more complex thus requiring【小题8】 (high)technical competence for daily maintenance by railway workers. For these diligent railway workers【小题9】 have skilled craftsmanship, improving their skills tirelessly to ensure safe operation of the trains seems like an 【小题10】 (end)learning curve throughout life.