Here are the suitable prepositions for each blank:

1. **for** - The organization's main goal is to provide clean drinking water **for** communities.

2. **of** - Students eagerly participate in Earth Day activities each year to raise awareness **of** environmental protection.

3. **and** - We can enjoy our vacation and help clean up the beach **at** the same time.

4. **around** - Environmental issues affect people all **around** the world, regardless of where they live.

5. **to** - The rainforest is home **to** a lot of valuable kinds of wood and medicinal plants.

6. **into** - It's harmful to dump waste **into** lakes and rivers because it can contaminate the water and harm aquatic life.

7. **away** - We shouldn't throw **away** plastic bottles and cans; instead, we should recycle them to help the environment.