Answer:
1. I have been here for a million years
2. He must have finished his homework ages ago.
"The depletion of water resources is a worrisome trend that impacts much of the world," insisted Dr. Sutton.
As far as I can tell, the only mistake is the end of the quote, where the comma should be within the quotation marks.
The early difficulties of Elizabeth's reign secured him a deceitful peace on that side for a time