Final answer:
An adverb can be found in the sentence 'Divya drinks milk every day.' The phrase 'every day' functions as an adverb modifying the verb 'drinks'. Additionally, proper comma placement has been demonstrated in the review of the provided sentences.
Step-by-step explanation:
In the provided sentences, you can find an adverb in sentence (a): Divya drinks milk every day. The word 'every day' is functioning as an adverb, describing the frequency with which Divya drinks milk. Adverbs often modify verbs by giving us more information about the manner, place, time, frequency, or reason of the action that is described by the verb.
In this case, 'every day' is modifying the verb 'drinks' by telling us how often the action takes place. Commas are also an important part of the sentence structure. For reviewing the second part of your request which involves comma placement, here are the sentences corrected: I finally found my keys, and I got to work just in time. Mrs. Contreras threw out her old coffee table and cleaned the carpet.
Taking the elevator to the roof, we hoped we could see the skyline and the bay. Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy. I let my neighbor borrow my phone because she said hers was tapped by the police.