1. Pollution affects the environment in many ways

The environment .....................................................

2. The weather is bad, so we can't go hiking in the mountains

If the weather .........................................................

3. It's two years since the Hawaii volcano erupted

The Hawaii volcano ..............................................

4. David had gone home before we arrived

After.............................................................

5. We had lunch then we took sound the shops

Before.....................................................

6. The light had gone out before we got of the office

When. ...........................................................