Agaucho is mainly a man that sings riddles

Can someone me to find the right verbs and conjugations in spanish?

When could you attach the direct object pronoun to an infinitive verb? a: when an infinitive verb follows a conjugated verb. b: when an infinitive verb ends in a question. c: when a stem-changing verb ends in a question. d: when a stem-changing verb follows a conjugated verb.

Fill in the blanks with the present tense form of the appropriate verbs. tomás, patricia y yo somos estudiantes; nosotros ( (regresar / estudiar) en la universidad. tomás y patricia ( (necesitar / enseñar) llegar a la universidad a las nueve. patricia ( (tomar / llevar) una clase de inglés y tomás ( (cantar / trabajar) en la biblioteca.