问题描述：
The new railway station has been in _ since 2003,now it can _ people.(service)
People _ the river in the past,but now the _ has become better.(pollute)
We began to use the station in 1998.=The station _ _ _ _ since 1998.=The station _ _ _ _ since 1998.
People _ the river in the past,but now the _ has become better.(pollute)
We began to use the station in 1998.=The station _ _ _ _ since 1998.=The station _ _ _ _ since 1998.
问题解答：
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