Complete 1-4 with a/an,the,or-(no article)

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1. a - The sentence is referring to any specific cat, so a definite article is not needed.
2. no article - The sentence is referring to a general concept of intelligence, rather than a specific intelligence.
3. the - The sentence is referring to a specific group of students, so a definite article is needed.
4. no article - The sentence is referring to a general idea of freedom and independence.