To depend on

To runoff

To support

To degrade

To enhance

To destroy

To collapse

To discover

To leave

To believe

Exercise 8. Put verbs in brackets into the correct form.

1. Soil (to form) during a long process that may take thousands of years. 2. They all (to enjoy) the film except for me. 3. Soil pollution (to be) a build-up of toxic chemical compounds, salts, pathogens (disease-causing organisms), or radioactive materials. 4. Unhealthy soil management methods (to have degraded) seriously soil quality. 5. These results of heavy fertilizer (to increase) polluted runoff into the lakes and streams 6. 1 (not to do) home work because of illness. 7. I (to want to work} like an ecologist after I finish the University. 8. For instance, strawberry farmers in California {to fumigate) the soil with methyl bromide (to destroy) organisms. 9 Soil (to be) a mixture of mineral, plant, and animal materials. 10. He (to enjoy) listening to music now.

Exercise 9. Making Wh — question. Put them to underline words.

1. _____ we all enjoyed the film except for me? 2. in

BC, the ancient Sumerian cities of the southern Tigris-Euphrates

Valley in Mesopotamia depended on thriving agriculture? 3. it is

essential for all agricultural production? 4. _ this process

indiscriminately kills even beneficial micro organisms? 5. the