Meaning: 'Stimulation' refers to activities or experiences that engage the mind, keeping it active and alert, which is essential for Border Collies.

Wrong options:

• establishment: 'Establishment' refers to the act of setting up or creating something, which does not relate to the mental engagement needed by the dogs.
• estimation: 'Estimation' means making an approximate judgment or calculation, which is irrelevant in the context of mental engagement.
• condition: 'Condition' refers to the state of something, which does not convey the active engagement required for the dogs' mental needs.

Correct answer: destructive

Explanation: The word 'destructive' is an adjective that describes the type of behaviors exhibited by Border Collies when bored. It fits grammatically and contextually, as it aligns with the negative consequences of their actions.

Meaning: 'Destructive' means causing damage or harm, which accurately describes the behaviors of chewing and digging that can occur due to boredom.

Wrong options:

• abrupt: 'Abrupt' means sudden or unexpected, which does not accurately describe the ongoing behaviors of chewing and digging.
• mild: 'Mild' suggests gentleness or a lack of intensity, which contradicts the serious nature of the behaviors being described.
• periodical: 'Periodical' refers to something occurring at intervals, which does not fit the context of consistent destructive behaviors.

Correct answer: eminently

Explanation: The word 'eminently' is an adverb that emphasizes the high degree of trainability of Border Collies. It fits grammatically and contextually, enhancing the description of their trainability.

Meaning: 'Eminently' means to a notable or high degree, indicating that Border Collies are very trainable.

Wrong options:

• whole: 'Whole' refers to something complete or entire, which does not convey the degree of trainability.
• mostly: 'Mostly' implies a majority but not totality, which weakens the assertion of their trainability.
• minor: 'Minor' suggests something of lesser importance or degree, which contradicts the intended meaning of high trainability.

Correct answer: commensurate

Explanation: The word 'commensurate' is an adjective that means corresponding in size or degree; it fits grammatically and contextually, indicating that the exercise provided should match the energy levels of the collie.

Meaning: 'Commensurate' means equal in measure or extent, emphasizing the need for exercise that is appropriate for the dog's energy and stamina.

Wrong options:

• collaborative: 'Collaborative' refers to working together, which does not fit the context of matching exercise levels.
• collective: 'Collective' means done by people acting as a group, which is irrelevant in the context of individual exercise needs.
• evenly: 'Evenly' suggests uniformity, which does not convey the idea of matching energy levels appropriately.

Correct answer: distressed

Explanation: The word 'distressed' is an adjective that describes the emotional state of the dogs when they are left inactive or ignored. It fits grammatically and contextually, conveying the negative impact of isolation.

Meaning: 'Distressed' means experiencing anxiety or sorrow, which accurately reflects the emotional state of the dogs in such situations.

Wrong options:

• tossed: 'Tossed' means thrown or moved with force, which does not relate to the emotional state of the dogs.
• pinched: 'Pinched' refers to squeezing or compressing, which is not relevant to the context of emotional distress.
• consistent: 'Consistent' means unchanging in nature, which contradicts the idea of an emotional response to isolation.