问题描述：
改错 1.You'd better changing the water for the fish every day 请讲清楚为什么!
还有
2.It is relaxed to run slowly along the beach .
3.He is one of the greatest alive potes in the world.
4.There is extreme difficult work for us to do.
还有
2.It is relaxed to run slowly along the beach .
3.He is one of the greatest alive potes in the world.
4.There is extreme difficult work for us to do.
问题解答：
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