假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文．文中共有10處語言錯誤，每句中最多有兩處．每處錯誤僅涉及一個單詞的增加、刪除或修改．
增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞．
刪除：把多余的詞用斜線（\）劃掉．
修改：在錯的詞下畫一橫線，并在該詞下面寫出修改后的詞．
注意：
1． 每處錯誤及其修改均僅限一詞；
2． 只允許修改10處，多者（從第11處起）不計分．
Flowing through the centre of Guangzhou， the Pearl River plays an important role in the life of city． Each day， boats take people in and from work， and ships transport goods to factory and markets． The river is also a great source of entertain． Along the river banks， where you can see people walking， exercising and enjoy beautiful views． In recent years， locals had worked hard to improve the river environment． Among their efforts are planting trees along the banks or creating several new parks． Most important， they've reduced river pollution， making the water so clean as people can now fish in the river．