In "chicago" , Sandburg use rhyming and rhythm in his verbs. The usage of this verbs make "chicago" is really interesting to read and the readers can't help but to feel some sort of excitement by reading it
The punctuation should be a colon, if not then a coma but colon is definitely it.
Words that could reverse things, for example, 'however', 'turn out', 'next thing I know'.
Answer:
They had made him do more work. the second paragraph
Explanation: