Meaning: 'On' indicates a focus or interest in something, in this case, the act of learning languages.

Wrong options:

• in: The preposition 'in' suggests involvement or inclusion, which does not accurately convey the idea of being keen towards an activity.
• other: The word 'other' does not fit as it does not relate to the context of interest or inclination.
• than: The word 'than' is a conjunction used for comparisons, which does not fit in this context as it does not express interest.
• this: The word 'this' is a demonstrative pronoun that does not indicate interest and is not appropriate here.
• travel: The word 'travel' is a verb that does not fit as it does not express a state of being keen.
• go: The word 'go' is also a verb and does not convey the idea of being keen on an activity.

Correct answer: other

Explanation: The word 'other' is used to refer to additional languages beyond those already mentioned. It fits grammatically as it describes the type of languages that should be studied.

Meaning: 'Other' refers to additional or different languages apart from the ones already discussed.

Wrong options:

• in: The preposition 'in' does not fit as it does not describe a type of language.
• on: The preposition 'on' does not convey the idea of additional languages and is not appropriate here.
• than: The word 'than' is used for comparisons and does not fit in this context as it does not describe languages.
• this: The word 'this' is a demonstrative pronoun that does not refer to additional languages and is not suitable here.
• travel: The word 'travel' is a verb and does not describe a type of language.
• go: The word 'go' is also a verb and does not fit as it does not describe languages.

Correct answer: than

Explanation: The word 'than' is used as a conjunction for making comparisons. In this context, it is necessary to compare the number of languages learned, making it grammatically and contextually appropriate.

Meaning: 'Than' is used to introduce a comparison, indicating that learning more languages is being contrasted with learning just one.

Wrong options:

• in: The preposition 'in' does not fit as it does not serve a comparative function in this context.
• on: The preposition 'on' does not indicate a comparison and is not suitable here.
• other: The word 'other' does not fit as it does not serve a comparative purpose.
• this: The word 'this' is a demonstrative pronoun and does not function as a comparative conjunction.
• travel: The word 'travel' is a verb and does not fit as it does not serve a comparative function.
• go: The word 'go' is also a verb and does not fit in this context.

Correct answer: travel

Explanation: The word 'travel' is a verb that fits grammatically and contextually as it describes an action that can be enhanced by knowing more than one language. It aligns with the overall message of the importance of language learning.

Meaning: 'Travel' refers to the act of moving from one place to another, often for leisure or exploration.

Wrong options:

• in: The preposition 'in' does not fit as it does not describe an action related to language learning.
• on: The preposition 'on' does not convey an action and is not appropriate here.
• other: The word 'other' does not fit as it does not describe an action.
• than: The word 'than' is a conjunction used for comparisons and does not fit as an action in this context.
• this: The word 'this' is a demonstrative pronoun and does not describe an action.
• go: The word 'go' is a verb but does not fit in this context as it does not convey the specific action of traveling.