Final answer:
Paragraphs 9-11 are likely to best convey Gore's view on the dual nature of environmental progress, recognizing successes while acknowledging ongoing challenges.
Step-by-step explanation:
To determine which paragraphs best convey Gore's point of view that significant work has been done to clean America's water, yet much remains to be done, we need to look for sections that both acknowledge past successes in environmental policy and at the same time highlight the ongoing challenges. The provided excerpts do not all directly reference Gore, but the prompt directs us to identify his perspective on environmental efforts. Based on the excerpts, paragraphs 9-11 seem to encapsulate this dual sentiment the best, acknowledging the quiet successes in environmental management while also noting the complacency and ongoing challenges, which align with Gore's activism and recognition of the ongoing struggle against climate change.