Answers:
[1]quiso¹
[2]quería²
[3]pudieron³
[4]podían⁴
Texto:
Cuando se lo ofrecieron, el anciano no quiso¹ asistir a clases de baile porque llevaba bastón y no quería² caerse.
Los nietos de Bernardo pudieron³ entrar en la universidad finalmente. ¡No se lo podían⁴ creer!
Translation:
When they offered it, the old man did not want to attend dance classes because he was carrying a cane and did not want to fall.
Bernardo's grandchildren were finally able to enter the university. They could not believe!