Meaning: 'Unless' means 'except if' or 'if not,' indicating that the automatic inclusion on the list will only happen if the person does not request to be removed.

Wrong options:

• if: 'If' suggests a condition but does not convey the necessary exclusion implied in the sentence, making it grammatically incorrect in this context.
• although: 'Although' introduces a contrast rather than a condition, which does not fit the intended meaning of the sentence.
• while: 'While' indicates simultaneous actions or contrasts, which does not align with the conditional nature required here.

Correct answer: reason

Explanation: The word 'reason' fits perfectly as it indicates the explanation for the argument made in the previous sentence. It is grammatically correct and contextually appropriate, as it introduces the rationale behind the need for more donors.

Meaning: 'Reason' refers to the explanation or justification for something, in this case, the need for organ donors due to the high number of people requiring transplants.

Wrong options:

• possibility: 'Possibility' refers to something that may happen, which does not provide the necessary explanation that 'reason' does in this context.
• detail: 'Detail' implies a specific piece of information, which does not capture the broader explanation that 'reason' provides.
• occasion: 'Occasion' refers to a particular time or event, which is unrelated to the explanation needed in this context.

Correct answer: are carried

Explanation: The phrase 'are carried' is in the present passive voice, which is appropriate here as it indicates that transplants are currently being performed. This fits grammatically and contextually with the ongoing situation described in the text.

Meaning: 'Are carried' means that the transplants are being conducted or performed, indicating an ongoing action in the present.

Wrong options:

• carry: 'Carry' is the base form of the verb and does not fit grammatically in this passive construction.
• carried: 'Carried' is the past participle but lacks the auxiliary verb 'are' to form the passive voice correctly in this context.
• had been carried: 'Had been carried' is in the past perfect tense, which does not align with the present context of the sentence.

Correct answer: available

Explanation: The word 'available' fits well as it describes the state of donors in the context of the sentence. It is grammatically correct and contextually relevant, indicating that there are not enough donors present to meet the rising demand.

Meaning: 'Available' means that something is present and ready for use, in this case, referring to the donors who can provide organs for transplants.

Wrong options:

• prepared: 'Prepared' implies readiness but does not convey the idea of being present or accessible, which is essential in this context.
• delighted: 'Delighted' refers to a feeling of pleasure, which is irrelevant to the context of organ donation and does not fit grammatically.
• ready: 'Ready' suggests preparedness but lacks the nuance of availability that 'available' provides in this specific context.

Correct answer: instead

Explanation: The word 'instead' indicates a contrast to the previous idea, suggesting that the bodies would belong to the state rather than to individuals. This fits grammatically and contextually, as it highlights the opposing viewpoint regarding automatic donation.

Meaning: 'Instead' means 'in place of' or 'as an alternative,' emphasizing the contrast between personal ownership and state ownership of bodies.

Wrong options:

• rather: 'Rather' is used to express preference but does not convey the same contrast as 'instead' does in this context.
• except: 'Except' indicates exclusion, which does not fit the contrasting relationship needed here.
• despite: 'Despite' introduces a concession rather than a contrast, making it inappropriate for the intended meaning of the sentence.