The correct word to fill in the blank is 'Abierto.' It is the past participle of the verb 'abrir' in Spanish.
Abierto is the correct word to fill in the blank. In this sentence, 'El restaurante no está abierto' means 'The restaurant is not open' in English. 'Abierto' is the past participle of the verb 'abrir' (to open) in Spanish.
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