... bird species are threatened with _____.a. appearance b. protection c. extinction d.destruction 10. We really ought to make a start on campaigns to _____ our polluted riversand seas.a. clean ... electricityc. using water power to produce electricityd. using tidal power to produce electricity 14. The water is so contaminated that it is not suitable for drinking.a. toxic b. salty c. dangerous ... parts of Idaho andMontana. It has many wild animals, (40) _____ bears, buffalo, elk, deer,antelope, coyotes, and lynxes, and is famous (41) _____ its fine scenery, hotsprings and (42) _____...