Meaning: Demand refers to the desire of customers for a particular product or service.

Wrong options:

• accelerator: Accelerator is a noun that refers to a device or mechanism that increases speed, which does not relate to customer needs in this context.
• further: Further is an adverb or adjective that indicates a greater distance or extent, which does not fit as it does not describe a customer need.
• stretch: Stretch is a verb that means to extend or enlarge, which does not apply to the context of customer needs.
• minimum: Minimum is an adjective that refers to the least amount possible, which does not fit as it does not describe a need.
• whether: Whether is a conjunction used to introduce alternatives, which does not relate to the concept of customer needs.
• practically: Practically is an adverb that means almost or nearly, which does not fit as it does not describe a customer need.

Correct answer: whether

Explanation: The word 'whether' serves as a conjunction that introduces alternatives, fitting grammatically and contextually as it presents the idea of considering two possibilities regarding the customer.

Meaning: Whether indicates a choice or condition between two alternatives.

Wrong options:

• accelerator: Accelerator does not fit as it is unrelated to the context of presenting alternatives regarding the customer.
• further: Further does not serve as a conjunction and does not fit the grammatical structure needed here.
• stretch: Stretch is a verb and does not function as a conjunction, making it inappropriate for this blank.
• demand: Demand is a noun and does not fit grammatically as a conjunction in this context.
• minimum: Minimum is an adjective and does not serve as a conjunction, thus it is not suitable here.
• practically: Practically is an adverb and does not fit the grammatical requirement for a conjunction.

Correct answer: further

Explanation: The word 'further' is used as an adverb here, indicating an additional stage in the production line, which fits both grammatically and contextually.

Meaning: Further refers to a greater distance or additional extent, in this case, along the production line.

Wrong options:

• accelerator: Accelerator does not fit as it refers to a device that increases speed, which is unrelated to the context of production stages.
• demand: Demand is a noun and does not fit grammatically as it does not describe a position along the production line.
• minimum: Minimum is an adjective that does not fit as it does not describe a position or extent in this context.
• whether: Whether is a conjunction and does not fit as it does not describe a position along the production line.
• stretch: Stretch is a verb that does not relate to the context of production stages.
• practically: Practically is an adverb that does not fit the context of describing a position along the production line.

Correct answer: minimum

Explanation: The word 'minimum' is an adjective that describes the least amount of waste, fitting grammatically and contextually in the sentence about production efficiency.

Meaning: Minimum refers to the least or smallest amount possible.

Wrong options:

• accelerator: Accelerator does not fit as it refers to a device that increases speed, which is unrelated to the context of waste in production.
• further: Further is an adverb or adjective that does not describe the amount of waste, making it inappropriate here.
• stretch: Stretch is a verb that does not relate to the context of waste and does not fit grammatically.
• demand: Demand is a noun and does not fit as it does not describe the amount of waste in this context.
• whether: Whether is a conjunction and does not fit as it does not describe the amount of waste.
• practically: Practically is an adverb that does not fit the context of describing the amount of waste.