Final answer:
The correct form of the verb 'cerrar' to fill in the blank in the question is 'cierren'.
Step-by-step explanation:
The correct form of the verb 'cerrar' to fill in the blank in the question is cierren. The sentence is asking if 'you' want 'us' to close the window. In this context, 'quieres' is the second person singular form of the verb 'querer' (to want), and 'nosotros' is the pronoun for 'us'. To match the subject and verb in person and number, we use the third person plural form of the verb 'cerrar', which is 'cierren'.
Learn more about Spanish verb conjugation