题目内容

The Qinghai-Tibet Railway in China is the world's_____ (high) railway line.

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Li Hua goes to school by bike every morning. It's fun and_____ (health).

It is_____ (expense) to take a taxi in big cities.

The subway is fast, cheap, and almost always on time, but it is often_____ (crowd).

London's Waterloo is the busiest station in England, with over 100 million people_ (arrive) and_ (depart) each year.