Directions: Choose the word that completes each blank in the passage.
     Beyond the nuisance factor, mosquitoes are carriers, or vectors, for some of humanity’s most __1__ illnesses, and they are public enemies in the fight against global __2__ disease. __3__ diseases cause millions of deaths worldwide every year with a disproportionate effect on children and the elderly in developing countries.
     There are more than 3,000 species of mosquitoes, but the members of three bear primary responsibility for the __4__ of human diseases. Anopheles mosquitoes are the only species known to carry malaria. They also __5__ filariasis (also called elephantiasis) and encephalitis. Culex mosquitoes carry encephalitis, filariasis, and the West Nile virus. And Aedes mosquitoes, of which the voracious Asian tiger is a member, carry yellow fever, dengue, and encephalitis.
Adapted from: http://animals.nationalgeographic.com/animals/bugs/mosquito/