Since this is a poem and you have a comma after river bank, the answer would be Halting because it is starting a new line. River should not be capitalized in this sentence because it is not a proper noun. It is just a common noun.
Cognates are words from different languages that look similar and mean the same thing. These words are usually derived from and share the same etymological origin, which is an advantage if you're looking forward to learning a new language. For example, several words in other languages such as French and Spanish have similar appearances and meanings in English, with a few even having the same spelling.
The word choice is action words such as fall, run ect.