Meaning: 'Ultimate' means the final or most significant in a series, indicating that the solution to the AIDS crisis is of utmost importance.

Wrong options:

• first: 'First' implies the initial step rather than the most significant solution, which does not align with the context of seeking a comprehensive answer.
• next: 'Next' suggests a subsequent step rather than the most crucial solution, failing to convey the importance of the solution needed.
• important: 'Important' is a general term that does not convey the finality or significance implied by 'ultimate,' making it less suitable in this context.

Correct answer: suffering

Explanation: The word 'suffering' fits grammatically and contextually as it describes the negative impact of AIDS on individuals, aligning with the goal of preventing such experiences through vaccination.

Meaning: 'Suffering' refers to the experience of pain or distress, indicating the adverse effects of AIDS that the vaccine aims to prevent.

Wrong options:

• repelling: 'Repelling' suggests driving away or rejecting, which does not accurately describe the context of preventing illness.
• contracting: 'Contracting' refers to acquiring a disease, but it does not capture the broader emotional and physical pain associated with AIDS.
• passing: 'Passing' implies a different context, often related to time or movement, and does not fit the intended meaning of preventing distress.

Correct answer: preventive

Explanation: The word 'preventive' fits grammatically and contextually as it describes a vaccine designed to stop the onset of AIDS, aligning with the overall goal of eradicating the disease.

Meaning: 'Preventive' means intended to stop something from happening, in this case, the onset of AIDS through vaccination.

Wrong options:

• remedial: 'Remedial' suggests a corrective action after a problem has occurred, which does not align with the proactive approach of vaccination.
• curative: 'Curative' implies a treatment for an existing condition rather than prevention, making it unsuitable in this context.
• corrective: 'Corrective' also implies addressing something after it has gone wrong, which does not fit the preventive nature of the vaccine discussed.

Correct answer: meanwhile

Explanation: The word 'meanwhile' fits grammatically and contextually as it indicates that while efforts are being made, AIDS continues to spread, highlighting the ongoing nature of the crisis.

Meaning: 'Meanwhile' means at the same time, suggesting that despite the efforts, the situation remains critical.

Wrong options:

• ultimate: 'Ultimate' does not fit here as it refers to the finality of a solution rather than the concurrent situation of AIDS spreading.
• period: 'Period' does not convey the sense of simultaneous events and is more of a temporal marker, making it contextually inappropriate.
• instance: 'Instance' refers to a specific occurrence, which does not capture the ongoing nature of the AIDS crisis as effectively as 'meanwhile'.

Correct answer: response

Explanation: The word 'response' fits grammatically and contextually as it refers to the actions taken to address the AIDS crisis, emphasizing the need for a comprehensive approach.

Meaning: 'Response' means an answer or reaction to a situation, in this case, the actions needed to combat AIDS.

Wrong options:

• answer: 'Answer' is too simplistic and does not encompass the broader actions and strategies implied by 'response.'
• cure: 'Cure' suggests a solution for those already affected, while 'response' includes preventive measures and broader strategies, making it less fitting.
• reply: 'Reply' implies a direct answer to a question, which does not capture the complexity of addressing a public health crisis like AIDS.