An oxymoron is the literary device used by Romeo in that passage.
Answer:
Janice is ready to graduate and has a new job lined up at a law firm in Boston.
Explanation:
Janice is already to graduate and has a new job lined up at a law firm in Boston
"Already" would be the one word used incorrectly, a more appropriate word would be just simply "ready"
Answer:
You might take the idiom literally and you might think something different happened
Hope this helps :)
Answer:
who's needs to be replaced by which to make the sentence correct.