Direction: In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.

Some diseases have an animal reservoir, meaning they can infect other species besides humans. Yellow fever, for example, (1)______ humans, but can also infect monkeys. If a mosquito (2)______ of spreading yellow fever bites an infected monkey, the (3)______ can then give the disease to humans. So even if the (4)______ population of the planet could somehow be vaccinated (5)______ yellow fever, its eradication could not be guaranteed.