Meaning: 'Illustration' refers to an example or a visual representation that helps explain or clarify a concept.

Wrong options:

• classification: Classification refers to the action of arranging or organizing into categories, which does not fit the context of providing an example.
• specification: Specification implies a detailed description or requirement, which is not suitable here as it does not convey the idea of an example.
• indication: Indication suggests a sign or piece of information, which does not align with the context of illustrating a point.

Correct answer: typewriters

Explanation: The word 'typewriters' is the correct noun that fits the context of the sentence, as it refers to the machines that the monkeys are supposedly using. It is grammatically correct and contextually relevant to the discussion about monkeys typing.

Meaning: 'Typewriters' are mechanical devices used for typing text, which fits the scenario of a monkey sitting at a typewriter.

Wrong options:

• machines: While 'machines' is a broad term that could refer to typewriters, it lacks the specificity needed in this context.
• keyboards: Keyboards are input devices for computers, not relevant to the historical context of monkeys typing, which refers to typewriters.
• bananas: Bananas are a type of fruit and do not fit the context of the sentence, which is about typing.

Correct answer: striker

Explanation: The word 'striker' fits grammatically as a noun that describes a part of the typewriter mechanism. Contextually, it refers to the action of striking keys, which is relevant to the typing process being discussed.

Meaning: 'Striker' refers to a component that strikes the paper when a key is pressed on a typewriter, essential for producing text.

Wrong options:

• push: 'Push' is a verb that does not fit grammatically as a noun in this context.
• press: 'Press' is also a verb and does not serve as a noun here, making it unsuitable for the blank.
• knot: 'Knot' refers to a fastening made by tying a piece of string or rope, which is irrelevant to the context of typing.

Correct answer: striker

Explanation: The word 'striker' is again the correct noun that fits the context of the sentence, referring to the action of striking keys on a typewriter. It is grammatically correct and maintains consistency with the previous usage in the text.

Meaning: 'Striker' in this context refers to the mechanism that strikes the paper when a key is pressed, crucial for typing.

Wrong options:

• press: 'Press' is a verb and does not fit grammatically as a noun in this context.
• knot: 'Knot' is unrelated to typing and does not fit the context of the sentence.
• push: 'Push' is also a verb and does not serve as a noun here, making it unsuitable for the blank.