Final answer:
This response provides the corrected sentences with the appropriate comma placement.
Step-by-step explanation:
1. I finally found my keys, and I got to work just in time.
2. Mrs. Contreras threw out her old coffee table and cleaned the carpet.
3. Taking the elevator to the roof, we hoped we could see the skyline and the bay.
4. Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy.
5. I let my neighbor borrow my phone because she said hers was tapped by the police.