... irrigating deserts, draining swamps and pushing back the sea.a. with b. about c. of d. in7. Farmers can help enrich the soil ______fertilizers.a. to add b. by adding c. of adding d. in spite of adding8. ... prison. a.with b. about c.for d.through13.Conservation is also concerned _____ the reclaiming of land. a.with b. in c.about d.at14. I will see him when he _______ here tomorrow.a. comes b. will come ... contained _____ important information.a. many b. another c. an d. a lot of20. More and more pollution ________ by that factory.a. produced b. produces c. is being produced d. is producing21. Thank...