Meaning: 'Probably' means 'likely to happen or be true,' suggesting that the early weaving machines were likely simple in design.

Wrong options:

• merely: 'Merely' means 'only' or 'just,' which does not convey the sense of likelihood needed in this context.
• substantially: 'Substantially' implies a significant degree, which contradicts the context of describing the simplicity of early machines.
• ethically: 'Ethically' relates to moral principles, which is irrelevant to the description of weaving machines.

Correct answer: easily

Explanation: The word 'easily' is an adverb that describes the manner in which the weft was inserted, fitting grammatically and contextually as it indicates that the process became simpler with the use of looms. This aligns with the overall tone of the passage, which discusses advancements in weaving technology.

Meaning: 'Easily' means 'without difficulty,' suggesting that the insertion of the weft was made simpler with the new machines.

Wrong options:

• fastly: 'Fastly' is not a standard adverb in English; the correct form is 'quickly,' which does not fit the context of ease of insertion.
• severely: 'Severely' implies a harsh or serious manner, which contradicts the intended meaning of simplicity in the weaving process.
• subtlely: 'Subtlely' is a misspelling of 'subtly,' which means in a delicate or understated way, not fitting the context of ease.

Correct answer: principles

Explanation: The word 'principles' fits grammatically as a noun that refers to fundamental truths or propositions that serve as the foundation for a system of belief or behavior. Contextually, it aligns with the discussion of the foundational concepts of spinning and weaving that have remained unchanged.

Meaning: 'Principles' means the basic truths or rules that guide the processes of spinning and weaving.

Wrong options:

• ideas: 'Ideas' are more abstract and do not convey the foundational aspect as strongly as 'principles' does in this context.
• examples: 'Examples' refer to specific instances, which do not fit the context of discussing the foundational concepts of spinning and weaving.
• fatals: 'Fatals' refers to something causing death or disaster, which is irrelevant and does not fit the context at all.

Correct answer: automating

Explanation: The word 'automating' fits grammatically as a gerund that describes the action of making processes automatic. Contextually, it aligns with the passage's focus on advancements during the industrial revolution that improved efficiency in spinning and weaving.

Meaning: 'Automating' means making a process operate automatically, which reflects the technological advancements discussed in the passage.

Wrong options:

• accomodating: 'Accomodating' means to provide space or adjust to needs, which does not fit the context of improving processes in weaving.
• rating: 'Rating' refers to assessing quality or value, which is unrelated to the context of technological advancements in weaving.
• inflating: 'Inflating' means to fill with air or exaggerate, which does not apply to the context of improving weaving processes.