Meaning: 'Volume' refers to the quantity of three-dimensional space an object or substance occupies, in this case, the amount of water in the river.

Wrong options:

• state: State refers to a condition or situation, which does not apply to the measurement of a river's size.
• subject: Subject typically refers to a topic or theme, not a measurement of a river's size.
• name: Name refers to the title or designation of something, which is not relevant to the physical measurement of the river.

Correct answer: depending

Explanation: The word 'depending' is appropriate here as it indicates that the classification of the Amazon as the longest river is conditional on the perspective of the person being asked. This aligns with the context of differing opinions about the river's length.

Meaning: 'Depending' means that something is contingent upon or influenced by something else, in this case, the opinion of the person asked.

Wrong options:

• focusing: Focusing implies concentrating attention on something, which does not fit the context of conditional statements about length.
• turning: Turning suggests a change in direction or position, which is not relevant to the context of opinions about river length.
• pending: Pending indicates something that is awaiting a decision or resolution, which does not apply to the context of asking for opinions.

Correct answer: asserted

Explanation: The word 'asserted' fits grammatically and contextually as it means to state a fact or belief confidently and forcefully. This aligns with the idea that some people claim the Amazon is longer, fitting well into the narrative of differing opinions.

Meaning: 'Asserted' means to state a fact or belief confidently, indicating that some people have made strong claims about the Amazon's length.

Wrong options:

• desserted: Desserted is a misspelling of 'deserted,' which means abandoned, and does not fit the context of making claims.
• exerted: Exerted means to apply force or influence, which does not relate to making a claim about the river's length.
• inserted: Inserted means to place something inside something else, which is not relevant to the context of making a statement.

Correct answer: namesake

Explanation: The word 'namesake' fits grammatically as it refers to something that has the same name as another. In this context, it refers to the online company named after the Amazon River, making it contextually appropriate.

Meaning: 'Namesake' refers to a person or thing that has the same name as another, indicating the online company shares its name with the river.

Wrong options:

• keepsake: Keepsake refers to a sentimental item kept for remembrance, which does not fit the context of naming.
• sake: Sake refers to a reason or purpose, which is not relevant to the naming context.
• forsake: Forsake means to abandon or give up something, which does not apply to the context of naming.