The subway is fast, cheap, and almost always on time, but it is often_____ (crowd).
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London's Waterloo is the busiest station in England, with over 100 million people_____ (arrive) and_____ (depart) each year.
You must not drive_____ (喝酒之后).
_____ (直走) and cross the First Street, then turn left.
For many people, the best way to _____ (到处走动) downtown is just to walk.