Meaning: 'Vaccination' refers to the process of administering a vaccine to help the body develop immunity against a disease.

Wrong options:

• prescription: 'Prescription' refers to a doctor's instructions for medication, which does not relate to the historical context of immunization.
• drug: 'Drug' is a general term for a substance used for medical treatment, but it lacks the specific context of immunization history.
• vacancy: 'Vacancy' refers to an unoccupied position or space, which is unrelated to the topic of vaccination.

Correct answer: venom

Explanation: The word 'venom' is the correct choice as it refers specifically to the toxic substance produced by snakes, which fits the context of the monks attempting to immunize themselves. It is a noun that matches the grammatical structure of the sentence.

Meaning: 'Venom' is a toxic substance secreted by some animals, including snakes, that can cause harm or illness.

Wrong options:

• velocity: 'Velocity' refers to the speed of something in a given direction, which does not relate to the context of snake bites or immunization.
• rhythm: 'Rhythm' pertains to a pattern of sounds or movements, which is irrelevant in the context of snake venom.
• venus: 'Venus' refers to the planet or the Roman goddess of love, which has no connection to the topic of snake venom.

Correct answer: carried

Explanation: The verb 'carried' is appropriate here as it indicates the action of performing the practice of inoculation. It fits grammatically in the past tense and contextually aligns with the widespread practice mentioned in the sentence.

Meaning: 'Carried' means to perform or conduct an action, in this case, the practice of inoculation.

Wrong options:

• put: 'Put' is too vague and does not convey the specific action of performing a medical practice, making it unsuitable in this context.
• practiced: While 'practiced' could fit, it does not match the sentence's structure as well as 'carried' does, which implies a broader action.
• excluded: 'Excluded' suggests something was left out, which contradicts the idea of a widely performed practice.

Correct answer: inoculating

Explanation: The term 'inoculating' is the correct choice as it describes the action of introducing a vaccine into a healthy human. It fits grammatically as a gerund that follows the structure of the sentence and contextually aligns with the process of vaccination.

Meaning: 'Inoculating' means to introduce a vaccine or antigenic substance into the body to induce immunity.

Wrong options:

• renovating: 'Renovating' refers to restoring or improving something, which does not apply to the context of vaccination.
• calculating: 'Calculating' involves mathematical computation, which is irrelevant to the process of inoculation.
• including: 'Including' suggests adding something to a group, which does not accurately describe the action of administering a vaccine.

Correct answer: controversial

Explanation: The word 'controversial' is appropriate as it describes the debates and differing opinions surrounding the use of the human smallpox vaccine. It fits grammatically as an adjective and contextually conveys the contentious nature of the topic.

Meaning: 'Controversial' means likely to cause disagreement or public debate, particularly regarding the use of the vaccine.

Wrong options:

• accepted: 'Accepted' implies general approval, which contradicts the idea of controversy surrounding the method.
• popular: 'Popular' suggests widespread favor, which does not align with the contentious nature of the vaccine's use.
• contributed: 'Contributed' refers to giving or adding to something, which does not fit the context of discussing the nature of the vaccine.

Correct answer: universalized

Explanation: The term 'universalized' is the correct choice as it indicates that the method of vaccination became widely adopted. It fits grammatically as a past participle and contextually aligns with the idea of the method being accepted across different populations.

Meaning: 'Universalized' means to make something applicable or available to all, in this case, the method of vaccination.

Wrong options:

• exclusive: 'Exclusive' suggests something is limited to a particular group, which contradicts the idea of widespread adoption.
• urbanized: 'Urbanized' refers to the process of making an area more urban, which is irrelevant to the context of vaccination.
• realized: 'Realized' means to become aware of something or to achieve something, which does not fit the context of the method's adoption.