Answer 1: pasaba.
Explanation : The adverb "siempre" indicates a habitual action, so the verb must be conjugated in imperfect form.
Answer 2: leyó.
Explanation : The action of the verb happened once in the past, so the verb must be conjugated in preterite form.
Answer 3: decía.
Explanation : What is said in a written story is still being said, so the verb must be conjugated in imperfect form.
Answer 4: demostraba.
Explanation : The adverb "nunca" indicates a habitual action, so the verb must be conjugated in imperfect form.
Answer 5: asistió.
Explanation : The action of attending the university is finished in the past, so the verb must be conjugated in preterite form.
Answer 6: decidió.
Explanation : The decision to study law is an action that happened once in the past, so the verb must be conjugated in preterite form.
Answer 7: gustaban.
Explanation : The action of the verb "gustar" is habitual, so the verb must be conjugated in imperfect form.
Answer 8: jugaba.
Explanation : The action of the verb "jugar" is habitual, so the verb must be conjugated in imperfect form.
Answer 9: fue.
Explanation : The action of the verb finished in the past, because today he is not a football player, so the verb must be conjugated in preterite form.
Answer 10: conducía.
Explanation : The adverb "mientras", indicates that the action of this verb was being done when the action of another was initiated, so this verb must be conjugated in imperfect form.
Answer 11: tuvo.
Explanation : Having an accident is an action that happened once in the past, so the verb must be conjugated in preterite form.
Answer 12: pasó.
Explanation : Being two months in the hospital is an action completed in the past, so the verb must be conjugated in preterite form.
Answer 13: comenzó.
Explanation : Start studying something is an action that happened once in the past, so the verb must be conjugated in preterite form.
Answer 14: compuso.
Explanation : The action of composing those songs happened once in the past, so the verb must be conjugated in preterite form.
Answer 15: pudo.
Explanation : The action of being able to go back somewhere happened once in the past, so the verb must be conjugated in preterite form.
Answer 16: terminó.
Explanation : Finish studying something is an action that happened only once in the past, so the verb must be conjugated in preterite form.
Answer 17: llegó.
Explanation : Become a lawyer is an action that happened once in the past, so the verb must be conjugated in preterite form.
Answer 18: Abandonó.
Explanation : Give up an idea is an action that happened once in the past, so the verb must be conjugated in preterite form.
Answer 19: grabó.
Explanation : Record a disc is an action that happened once in the past, so the verb must be conjugated in preterite form.
Answer 20: se hizo.
Explanation : Become famous is an action that happened once in the past, so the verb must be conjugated in preterite form.