Final answer:
The appropriate word to complete the sentence is 'inteligente.'
Step-by-step explanation:
El perro es muy inteligente. O blanco, O blancas, O blancos, O blanca.
The appropriate word to complete the sentence is
inteligente. Since 'perro' is singular and masculine, we use the singular masculine form 'inteligente.' The options 'blanco', 'blancas', 'blancos', and 'blanca' are not correct as they don't agree with the noun 'perro' in gender or number.
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