The correct preterite or imperfect form of the verb in parentheses is:
<em><u>Trabajé</u></em>.
<em>- </em><em>Yo </em><em><u>trabajé</u></em><em></em><em>mucho en la tienda todos los días.</em>
Explanation:
The translation of the sentence is:
- I <u>worked</u> a lot in the store every day.
The correct conjugation of the verb in parentheses is <u><em>"trabajé,"</em></u> which belongs to the conjugation in <u>Preterite</u>, this is <u>because within the sentence is the moment in which the action is performed (every day)</u>, in case the time is not mentioned, the Imperfect conjugation would be used. which would be for that same verb <em>"trabajaba."</em>
