Final answer:
The sentences have been corrected for comma usage: commas have been added to separate clauses and lists, and an unnecessary comma has been removed. Proper punctuation helps clarify sentence structure and meaning.
Step-by-step explanation:
Comma Insertion and Omission
To properly punctuate the given sentences, we need to insert missing commas where necessary and remove incorrectly placed ones. Here are the sentences with the correct punctuation:
- 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.
Appropriate use of commas can clarify the meaning of sentences by separating clauses, lists, and contrasting ideas.