Final answer:
The student is asked to correct the use of commas in given sentences.
Step-by-step explanation:
The student is asked to insert missing commas or omit incorrectly placed commas in each of the given sentences. Here are the correct versions of the sentences:
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.