| 1 | The channel of the river filled up with mud. | |
| 2 | Do you know why the river narrows here? | |
| 3 | They have to dredge the canal so that ships can use it. | |
| 4 | Workers expect to finish the channel in a week. | |
| 5 | The river frets at its banks until a new channel is formed. |
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