Answer:
1. F. Polluted water cannot sustain life.
2. A. Many factories dump their waste products into rivers and streams.
3. D. We wash these chemicals down our drains every day.
4. E. So how can we stop indiscriminate polluting?
5. H. Those who still do so should be given heavy fines.
6. For everyone else, start recycling at home and dispose of rubbish properly.
Step-by-step explanation:
When we need to fill in the blanks with entire sentences, there are two good ways to figure out which ones will most likely be correct. First, read all the options and then the text. By doing that, you will already have an idea of what the options are about and will most likely realize which paragraph they fit in.
Second, look for the same words in both the option and the text. For instance, if a paragraph mentions "chemicals", the option that also mentions that word will likely be the one to complete that blank.