The inclusion of reputable sources and specific facts would best strengthen the author's main argument because it would offer factual proof instead of just the author's opinion on the matter.
Spicy food boosts production of feel-good hormones such as serotonin, which help reduce stress, anger and ease depression. Sad or depressed, a chili or two may help boost your mood.
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The question is referring to a contrast so the proper phrase would be "on the other hand".
This phrase means something along the lines of "looking at the other side" which refers to the other situation or event.
In fact means giving a true example
In other societies means examples of ideas from other places
For example is just giving an example
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DO Direct Object because "that the monthly bills be paid before the end of the month" can be replaced with "it" -- a pronoun.