The only verb to agree in number with the subject is "vais," the second person plural informal form of ir.

English translation: "Boys, where are you-all going?"

The correct answer is "sucios" (dirty) because it agrees in number and gender with "los platos" and because it makes sense in context. The answer choice "rotos" (broken) wouldn't make sense because there's no reason to wash broken plates.

English translation: "The plates are dirty, so one must wash them."

The correct answer is "gustaría," the conditional tense. When translated the sentence means "I would like to go to the concert but I don't have money."

"Gusto" is the wrong tense and person. "Gustaba" and "gustó" are the wrong tense, and "gustan" is the wrong tense and number.

Both "único" (only) and "segundo" (second) agree in number and gender with "hijo;" however, only "único" (only) fits in context, as it would not make sense for someone to say that they are an "hijo segundo" (second child) if that person is claiming not to have any siblings.

English translation: "I do not have siblings; I am an only child."

The correct answer is "gustaría," the conditional tense. When translated the sentence means "I would like to go to the concert but I don't have money."

"Gusto" is the wrong tense and person. "Gustaba" and "gustó" are the wrong tense, and "gustan" is the wrong tense and number.

The correct answer is "gustaría," the conditional tense. When translated the sentence means "I would like to go to the concert but I don't have money."

"Gusto" is the wrong tense and person. "Gustaba" and "gustó" are the wrong tense, and "gustan" is the wrong tense and number.

The correct answer is "gustaría," the conditional tense. When translated the sentence means "I would like to go to the concert but I don't have money."

"Gusto" is the wrong tense and person. "Gustaba" and "gustó" are the wrong tense, and "gustan" is the wrong tense and number.

The correct answer is "gustaría," the conditional tense. When translated the sentence means "I would like to go to the concert but I don't have money."

"Gusto" is the wrong tense and person. "Gustaba" and "gustó" are the wrong tense, and "gustan" is the wrong tense and number.

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.