Can someone plsss help

Pls
Spanish

Fill in the empty boxes thx

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.

Which verb form best completes this sentence? a paco no le gustan estas pinturas porque él no el arte de los siglos pasados. a. comprendes b. comprende c. comprendo d. comprenden

Which word best completes the sentence? en los restaurantes de ecuador, la gente fumar en el exterior. a. necesario b. ni c. siempre d. debe