The present participle funcionando is correct; funciona is in the wrong tense; roto doesn't make sense in context (one doesn't fix a car that isn't broken); trabajando is bad Spanish and wrong in context, although it is in the right tense.(Machines function, men and animals work).

The present participle funcionando is correct; funciona is in the wrong tense; roto doesn't make sense in context (one doesn't fix a car that isn't broken); trabajando is bad Spanish and wrong in context, although it is in the right tense.(Machines function, men and animals work).

The only verb that fits the impersonal necessity haber construction of this sentence is the infinitve bañar. Bañaba and baña are in the wrong tenses, and voltar, while in the right tense, makes no sense in context.

The only verb that fits the impersonal necessity haber construction of this sentence is the infinitve bañar. Bañaba and baña are in the wrong tenses, and voltar, while in the right tense, makes no sense in context.

Ser is the only correct answer as it is both the only verb that agrees grammatically with the adjective libre. Further, the infintive structure is neccesary as the verb's indicative form, soy, would be incorrect in an impersonal statement.

The correct answer is salir. Because of the "de" the following word must be in the infinitive form.

Ser is the only correct answer as it is both the only verb that agrees grammatically with the adjective libre. Further, the infintive structure is neccesary as the verb's indicative form, soy, would be incorrect in an impersonal statement.

The correct answer is salir. Because of the "de" the following word must be in the infinitive form.

The verb has (haber) requires the past participle, the only example of which here is traicionado.

The verb has (haber) requires the past participle, the only example of which here is traicionado.