IV. Choose the best answer to complete the sentences. 1. The river water is severely polluted, mostly________ the dumping of raw sewage. A. due to B. lead to C. because D. so 2. Sudden changes in water temperature can ________ mass killings of fish, plants, or amphibians. A. come up B. result in C. dump into D. thank to 3. Water pollution________ the death of all forms of life in the water bodies. A. occurs B. results of C. creates D. leads to 4. ________ plastic takes so long to break down, it pollutes the land and ocean. A. Because B. Due to C. Even if D. Although 5. Many flights were cancelled ________ the smoke from forest fires. A. so B. because C. because of D. result in 6. ________the garbage dump smells terrible, no one lives around there. A. Because of B. As C. As a result of D. Even though 7. ________the grain consumption is rising, forests will be cut to provide more room for planting crops. A. since B. Although C. unless D. Due to 8. Grace didn’t love nature, ________ she wasn’t happy when her group went camping in a jungle. A. but B. and C. because D. so 9. Thousands of fish were killed ________ a discharge of poisonous Chemicals from a nearby factory. A. because B. lead to C. result in D. as a result of 10. ________the fog, there were no take-oils from the airport yesterday. A. Since B. Because C. Owing to D. Thanks to