III. Choose the best answer. 1. __________ pollution is harmful or annoying level of noise, as from vehicles, industry activities, etc. A. light B. visual C. soil D. noise 2. This picture __________ the contamination of ground water. A. illustrate B. illustrating C. illustrates D. illustrated 3. Parents should teach children not to __________ wastes on the road. A. litter B. poison C. cause D. measure 4. I can’t hear your voice __________ I’m wearing an earplug. A. although B. due C. however D. because 5. What is _________ official language of your country? A. a B. an C. the D. x 6. Scientists have just come up __________ a solution to hearing loss. A. to B. on C. with D. down 7. What would you do if a factory in your neighborhood ________ untreated water into the river? A. dump B. dumped C. dumping D. dumps 8. English is the _______ language of many countries, including Britain and Philippines. A. official B. absolute C. unique D. puzzling 9. Canada is made up _________ 10 provinces and 6 territories. A. on B. of C. by D. with 10. Koalas are well-known as the symbol __________ Australia. A. of B. in C. on D. for