Meaning: 'Expose' means to make something visible or known, in this case, the core concepts of the subject matter.

Wrong options:

• native: The adjective 'native' refers to something inherent or originating from a particular place, which does not fit the context of introducing concepts.
• enlighten: The verb 'enlighten' means to give someone greater knowledge or understanding, but it does not fit the grammatical structure required after 'to.'
• collaborator: The noun 'collaborator' refers to someone who works jointly on an activity, which does not fit the context of exposing students to concepts.
• recipient: The noun 'recipient' refers to someone who receives something, which does not fit the action of introducing or exposing students to concepts.
• grapple with: The phrase 'grapple with' is a verb phrase that means to struggle with or try to deal with something, which does not fit the context of the blank that requires a verb meaning to introduce.

Correct answer: grapple with

Explanation: The phrase 'grapple with' is a verb phrase that indicates engaging with or struggling to understand the information. It fits contextually as it describes the active engagement of students with the material after being exposed to it.

Meaning: 'Grapple with' means to struggle or wrestle with a concept or problem, indicating active engagement with the information.

Wrong options:

• native: The adjective 'native' does not fit here as it does not convey the action of engaging with information.
• enlighten: The verb 'enlighten' does not fit the context of actively dealing with information; it suggests providing knowledge rather than engaging with it.
• collaborator: The noun 'collaborator' does not fit as it refers to a person working together, not an action related to engaging with information.
• recipient: The noun 'recipient' does not fit as it refers to someone who receives something, not someone who engages with information.
• expose: The verb 'expose' does not fit here as it refers to introducing concepts rather than engaging with them.

Correct answer: recipient

Explanation: The noun 'recipient' fits grammatically as it serves as the object of the preposition 'a,' and contextually it describes someone who passively receives knowledge, contrasting with the active engagement promoted by flipped learning.

Meaning: 'Recipient' refers to a person who receives something, in this case, knowledge in a passive manner.

Wrong options:

• native: The adjective 'native' does not fit as it does not describe a person receiving knowledge.
• enlighten: The verb 'enlighten' does not fit as it does not refer to a person but rather an action of providing knowledge.
• collaborator: The noun 'collaborator' does not fit as it refers to someone who works together, not someone who passively receives information.
• grapple with: The phrase 'grapple with' does not fit as it describes an action of engagement, not a passive role.
• expose: The verb 'expose' does not fit as it refers to the action of introducing concepts, not the role of receiving knowledge.

Correct answer: hard-wired

Explanation: The term 'hard-wired' fits grammatically as it is an adjective that describes humans in a way that suggests an innate tendency. Contextually, it aligns with the idea that humans have a natural inclination to solve problems.

Meaning: 'Hard-wired' means to be inherently or instinctively programmed to behave in a certain way, in this case, to solve problems.

Wrong options:

• native: The adjective 'native' does not fit as it refers to something inherent but does not convey the specific idea of problem-solving tendencies.
• grapple with: The phrase 'grapple with' does not fit as it describes an action rather than a characteristic of humans.
• expose: The verb 'expose' does not fit as it refers to introducing concepts, not describing a characteristic of humans.
• enlighten: The verb 'enlighten' does not fit as it refers to providing knowledge rather than describing an innate tendency.
• collaborator: The noun 'collaborator' does not fit as it refers to someone who works together, not a characteristic of human behavior.