Fill in each blank with one suitable word: Soil pollution can make ... die

Fill in each blank with one suitable word:
1. Soil pollution can make......................die
2. What do these three rs.......................for?
3. If we all use this kind of bag we'll help to protect the...........................
4. We should find....................ways to use our old items before throwing them away
5. If the river is not......................,there will be more fish