Pls help Spanish work

Which verb conjugation best completes this sentence! — tú__ pesas los sábados. a: levanta b: caminas c: levantas d: camina

Charlie u sophia visitaron méxico y argentina presented pasado futuro

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.