Meaning: 'Portrait' means a painting, drawing, or photograph of a person, particularly one that captures their likeness, which is exactly what will appear on the banknotes.

Wrong options:

• cornerstone: The term 'cornerstone' refers to a fundamental principle or element, which does not fit the context of depicting an image on banknotes.
• portion: 'Portion' means a part of a whole, which is not relevant when discussing the image of a person on currency.
• plagiarism: 'Plagiarism' refers to the act of copying someone else's work, which is unrelated to the context of banknotes and images.

Correct answer: remain

Explanation: The verb 'remain' is correctly used here to indicate that the rest of the design will stay unchanged. It fits grammatically in the future tense and contextually aligns with the idea of continuity in the banknote design.

Meaning: 'Remain' means to continue to exist or stay the same, indicating that the design will not change despite the new portrait.

Wrong options:

• surpass: 'Surpass' means to exceed or go beyond, which contradicts the idea of the design staying the same.
• signify: 'Signify' means to indicate or represent, which does not fit the context of the design remaining unchanged.
• replicate: 'Replicate' means to make an exact copy, which implies change rather than continuity.

Correct answer: respectively

Explanation: The adverb 'respectively' is used to indicate that the order of the items mentioned corresponds to the order of the subjects. It fits grammatically and contextually, clarifying that each portrait corresponds to the specific banknote mentioned.

Meaning: 'Respectively' means in the order given, which helps clarify that each person is featured on the corresponding banknote.

Wrong options:

• pervasively: 'Pervasively' means spreading widely throughout an area, which does not fit the context of listing specific portraits on banknotes.
• variously: 'Variously' means in different ways, which does not accurately describe the specific order of portraits on the notes.
• audaciously: 'Audaciously' means in a bold or daring manner, which is irrelevant to the context of listing portraits.

Correct answer: enter

Explanation: The verb 'enter' is appropriately used to indicate that the new banknotes will begin to circulate. It fits grammatically in the future tense and contextually aligns with the discussion of the introduction of new currency.

Meaning: 'Enter' means to come into a place or situation, in this case, referring to the new banknotes coming into circulation.

Wrong options:

• hinge: 'Hinge' refers to a joint or mechanism that allows movement, which does not fit the context of banknotes being introduced.
• divert: 'Divert' means to change direction or focus, which is not relevant to the introduction of new banknotes.
• inoculate: 'Inoculate' means to introduce a vaccine or to protect against something, which is unrelated to the context of currency circulation.