Here are the answers for the cloze test:

1. **D. supply** (The issue is about the supply of waste materials)
2. **A. examples** (Referring to the Rhine Rivers and Great Lakes as examples)
3. **C. cannot** (The water should not be drunk)
4. **B. attacked** (Referring to people being harmed)
5. **A. such** (Referring to polluted waters)

So the complete selections are:
1. supply
2. examples
3. cannot
4. attacked
5. such