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