Meaning: 'Complex' means something that is made up of many interconnected parts, making it difficult to understand.

Wrong options:

• verb: The word 'verb' is a noun that refers to a part of speech, which does not fit grammatically as it does not describe the nature of the tenses.
• native: 'Native' is an adjective that describes someone or something originating from a particular place, which does not apply to the description of tenses.
• enriches: 'Enriches' is a verb that does not fit in this context as it does not describe the tenses themselves.
• their: 'Their' is a possessive pronoun that does not modify 'tenses' and is not appropriate here.
• a few: 'A few' is a quantifier that does not describe the complexity of tenses and does not fit grammatically.
• the: 'The' is a definite article that does not provide any descriptive quality to 'tenses'.

Correct answer: native

Explanation: The term 'native' is an adjective that describes speakers who are fluent in the language as their first language. This fits grammatically as it modifies the noun 'speakers' and is contextually relevant to improving language skills.

Meaning: 'Native' refers to someone who speaks a language as their first language, providing authentic pronunciation and usage.

Wrong options:

• complex: 'Complex' is an adjective that does not describe speakers and is not relevant in this context.
• verb: 'Verb' is a noun that does not fit as it does not describe a type of speaker.
• enriches: 'Enriches' is a verb that does not apply to the description of speakers and does not fit grammatically.
• their: 'Their' is a possessive pronoun that does not modify 'speakers' appropriately in this context.
• a few: 'A few' is a quantifier that does not describe the type of speakers and is not suitable here.
• the: 'The' is a definite article that does not provide any descriptive quality to 'speakers'.

Correct answer: their

Explanation: The word 'their' is a possessive pronoun that indicates ownership of the sentences by the speakers. This fits grammatically as it modifies the noun 'sentences' and is contextually appropriate for discussing vocabulary usage.

Meaning: 'Their' indicates that the sentences belong to or are created by the speakers.

Wrong options:

• complex: 'Complex' is an adjective that does not indicate possession and does not fit grammatically in this context.
• verb: 'Verb' is a noun that does not relate to ownership and is not appropriate here.
• native: 'Native' is an adjective that does not indicate possession and does not fit in this context.
• a few: 'A few' is a quantifier that does not indicate ownership and is not suitable here.
• the: 'The' is a definite article that does not convey possession and does not fit grammatically.

Correct answer: enriches

Explanation: The verb 'enriches' describes the action of enhancing or improving one's perspective. This fits grammatically as it serves as the main verb of the clause and aligns with the context of discussing the benefits of learning a language.

Meaning: 'Enriches' means to improve or enhance the quality of something, in this case, one's perspective.

Wrong options:

• complex: 'Complex' is an adjective that does not convey an action and does not fit grammatically in this context.
• verb: 'Verb' is a noun that does not fit as it does not describe an action related to perspective.
• native: 'Native' is an adjective that does not convey an action and is not appropriate here.
• their: 'Their' is a possessive pronoun that does not fit as it does not describe an action.
• a few: 'A few' is a quantifier that does not convey an action and is not suitable here.
• the: 'The' is a definite article that does not convey an action and does not fit grammatically.