1. If we recycle more, we (help) .. ………………………… the earth.

2. Factories (not dump)… ………………. waste into the rivers if the government fines them heavy.

3. If people travel to work by bus, there (be) ………………….…….. fewer cars fumes.

4. We will save thousands of trees if we (not waste)……………………….. paper.

5. If we use waste water carefully, more people (have)…………...…… fresh water.

6. If you (be)……………..…. the president, what ………………..you (do)……………….?

7. They get sick so often. If they (exercise)…………… more, they (be)……….. healthier.

8. Ngoc’s mother is unhappy. If Ngoc (tidy)…………..……….. her room every day, her mother (not be)……………………… so upset.

9. There isn’t a garden at our house. If there (be……….., we (grow)……………….…..vegetables.

10. If the world temperatures (continue) ………………….to rise, there (be)……….less snow.