JocelynPauta would've been correct if the question is asking for the present "yo" form. However, it's asking for the preterite or imperfect.
To decide whether or not a verb should be preterite or imperfect, look for key words. In the sentence, "siempre" means "always". Since verbs in the preterite form only tell us actions that've only taken place ONCE, the verb in this case has to be imperfect.
Therefore, the correct form of sacar in this concept would be sacaba.
