Final answer:
The incorrect sentence is 'David looked forward with consternation to relaxing in his new hammock,' as consternation suggests anxiety, not relaxation. The review of comma usage corrects the example sentences to better conform with standard grammar rules.
Step-by-step explanation:
The sentence that uses the underlined vocabulary word incorrectly is: 'David looked forward with consternation to relaxing in his new hammock.' The word 'consternation' means feelings of anxiety or dismay, typically at something unexpected.
Therefore, it is not appropriate to use it in the context of looking forward to a relaxing activity. The correct usage should invoke a scenario where anxiety or dismay is an expected response. Now, let's review the comma usage in the example sentences provided: '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.'