The sentence explicitly contrasts the missing word with "loud and aggressive." The correct answer needs to mean softer and less aggressive. "Subdued," meaning restrained or controlled, is the best choice.

The body had to be moved to see "stomach wounds." The correct answer must therefore mean lying face down, the definition of "prostrate."

The meeting is one where no one "wanted it known" it was happening. The correct answer will reflect the meeting's discreet nature. "Clandestine," meaning secret or covert, is the best choice.

Because "halfheartedly" and "indifferently" mean that the person was not very concerned with cleaning the carpet, it would not make sense that the carpet was left so spotless. "Blithely" means happily, which also does not make sense. "Indignantly" could work  because it means that the person was not happy about having to clean the carpet, but "meticulously", which means painstakingly, makes the most sense because of the emphasis placed on how clean the carpet was afterward.

"Infallible" means faultless, while "disingenuous" means fake, but neither of these make sense because we are talking about Alejandra's interest in nursing increasing somehow. "Obliterated" means completely destroyed, which means that she had no interest to bolster whatsoever. "Nonexistent" would also indicate that she had no interest in nursing whatsoever, which also makes no sense; however "nascent", meaning coming into being, does make sense. 

Rain and sun are, for the most part, good for plant growth, which means that "calamitous," "grievous," "unfavorable," and "antagonistic" do not work. But "conducive," meaning making a certain outcome likely, is a good choice.

The sentence indicates the quality of the performance was such that people wondered "if he was even trying." This means the correct answer will show his performance was not good. "Abysmal," meaning extremely bad, is the best fit among the answers.

The band's music is "highly inappropriate for mainstream radio." The correct answer must reflect a sense of horribleness or offensiveness. "Noisome," meaning disgusting or repugnant, is the best answer choice.

"Voluble" and "loquacious" both mean talkative, which is probably not the case with this child. The child might be "irritable," meaning easily angered, or "desolate," meaning depressed. But "reticent," meaning silent makes more sense because the child is shy but has no reason to be angered or saddened.

There is something about the way Talia acts that made it impossible for her audiences to relate to her characters. So "sincere" and "forthcoming," both meaning honest, do not work. Meanwhile "eloquent" and "unfaltering" both describe someone who speaks with conviction. Thus "affected," meaning fake, is the best choice.