Meaning: 'Basic' means fundamental or essential, indicating that knowing the number of species is a primary requirement for conservation efforts.

Wrong options:

• supposed: 'Supposed' is the past participle of 'suppose' and does not fit grammatically as it does not describe 'need' appropriately in this context.
• supposedly: 'Supposedly' is an adverb and does not fit grammatically as it cannot modify the noun 'need' directly.
• basically: 'Basically' is also an adverb and does not fit grammatically as it cannot serve as an adjective to describe 'need'.

Correct answer: vital

Explanation: The word 'vital' is an adjective that conveys the importance of the need mentioned earlier. It fits grammatically as it describes the noun 'need' and contextually emphasizes the urgency of the situation in a changing world.

Meaning: 'Vital' means absolutely necessary or essential, highlighting the critical importance of understanding marine biodiversity.

Wrong options:

• primal: 'Primal' suggests something fundamental but often refers to ancient or original states, which does not fit the contemporary context of conservation.
• real: 'Real' is too vague and does not convey the urgency or necessity implied by the context of conservation efforts.
• fatal: 'Fatal' implies causing death, which is not relevant in this context and does not fit grammatically or contextually.

Correct answer: especially

Explanation: The word 'especially' is an adverb that emphasizes the significance of Southeast Asia in the context of marine biodiversity. It fits grammatically as it modifies the entire clause and contextually highlights the region's importance.

Meaning: 'Especially' means particularly or notably, indicating that Southeast Asia is a key area of concern for marine conservation.

Wrong options:

• forcefully: 'Forcefully' implies a strong or aggressive manner, which does not fit the context of discussing the importance of biodiversity.
• unilaterally: 'Unilaterally' suggests an action taken by one side without agreement, which does not apply to the context of conservation efforts.
• supposedly: 'Supposedly' implies uncertainty or assumption, which does not convey the intended emphasis on the importance of the region.

Correct answer: array

Explanation: The word 'array' is a noun that refers to a large group or collection, fitting grammatically as it serves as the subject of the sentence. Contextually, it emphasizes the diversity of marine life in Hong Kong.

Meaning: 'Array' means a wide range or variety, indicating the extensive diversity of marine species present in Hong Kong.

Wrong options:

• shrine: 'Shrine' refers to a place of worship or memorial, which does not fit the context of discussing marine life.
• mess: 'Mess' implies disorder or confusion, which is not relevant to the context of biodiversity and conservation.
• beseech: 'Beseech' is a verb meaning to urgently request, which does not fit grammatically or contextually as it does not describe a collection of marine life.

Correct answer: while

Explanation: The word 'while' is a conjunction that introduces a contrast or simultaneous action, fitting grammatically as it connects two clauses. Contextually, it indicates that the research team welcomes the initiative but also urges further action.

Meaning: 'While' means during the time that or although, suggesting a simultaneous acknowledgment of the new park and a call for more action.

Wrong options:

• since: 'Since' indicates a time reference or cause, which does not fit the context of contrasting actions or simultaneous acknowledgment.
• there: 'There' is an adverb indicating a place, which does not fit grammatically or contextually in connecting the two ideas.
• their: 'Their' is a possessive pronoun that does not fit grammatically as it cannot connect the clauses in the intended manner.