Personification because it's saying the river knows as if it is a person or higher being.
Er im very confused where is your question
Usually, I only take notes on key points and definitions.
When studying for a test, I give myself two notecards, and I reread everything throughout the section. The notecards are small enough that they force you to only take notes on the most important sections, and often times, those are the things that come in tests :)
Answer:
4 bottles
Explanation:
You could leave the end two bottles but otherwise the middle four have to be moved.
Hope this helps :)