Final answer:
The correct word to complete the sentence is 'querías'.
Step-by-step explanation:
The correct word to complete the sentence is querías. In the sentence, 'Tú querías una casa nueva,' the subject 'tú' (meaning 'you') is paired with the imperfect tense verb 'querías' (meaning 'you wanted'). This indicates that the person being referred to (you) had the desire or intention to have a new house in the past.
Learn more about Imperfect tense in Spanish