Final answer:
In example 1, a comma should be added after 'keys'. In example 2, a comma should be added after 'table'. In example 3, a comma should be added after 'skyline'. In example 4, a comma should be added after 'well'. No changes needed in example 5.
Step-by-step explanation:
In example 1, you can add a comma after the word 'keys' to separate the two independent clauses. The corrected sentence would be: 'I finally found my keys, and I got to work just in time'.
In example 2, you need to add a comma after the word 'table' to separate the two independent clauses. The corrected sentence would be: 'Mrs. Contreras threw out her old coffee table and cleaned the carpet'.
In example 3, you can add a comma after the word 'skyline' to separate the two items in the series. The corrected sentence would be: 'Taking the elevator to the roof, we hoped we could see the skyline and the bay'.
In example 4, you need to add a comma after the word 'well' to separate the two independent clauses. The corrected sentence would be: 'Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy'.
In example 5, the sentence is already correctly punctuated.