The "identity theft" changed the woman's attacks outlook on using her credit card, and the correct answer will reflect her reaction to the identity theft. "Wary," meaning hesitant or cautious, is the best fit among the answer choices.

Being thrown out of a game is a very serious penalty, and the correct answer will indicate the seriousness of the foul to warrant such a punishment. "Egregious," meaning extremely or obviously bad, is the correct answer.

The key phrase is the subordinate clause, "who was quite aware of his quick temper." The volatile situations are compared to this temper, which alters quickly. The most tempting wrong answers are "agitated" and "unknown." Either of these (particularly the latter) could indicate a changing mood that is volatile; however, "mercurial" is more directly related in meaning to such a characteristic of having a changing mood.

The second sentence gives the sense of the blank. The grandmother clearly does not want the medicine; therefore, she must not know about it. Although we might be tempted by "underhandedly," there is not reason to add such negative tones. "Silently" might be tempting because of the secrecy, but it is not the best option. The best answer would be "surreptitiously," which best captures the secrecy of the grandson's action, without adding any other meanings.

The structure of the sentence effectively pairs the correct answer with "cleverness." The correct answer will therefore be a synonym of "cleverness" or wit. "Perspicacious," meaning insightful or sharp, is the best choice.

The "self-destruct button" and the pilot being alarmed indicate the seriousness of the situation. The correct answer will need to appropriately fit this context in the sentence.  "Irrevocable," meaning unchangeable or unable to be cancelled, is the best fit among the choices.

The contrasting of the missing word with "generous" indicates the correct answer will be a highly negative word. "Nefarious," meaning wicked or immoral, is the best choice.

The sentence contrasts the "family friendly veneer of the show" with the missing word.  The best fit will be a word indicating something not "family friendly."  "Subversive," meaning undermining or rebellious, is the correct answer choice.

The key to the sentence is that the subject is a "cheap man." The correct answer choice will mean it suited the subject's cheapness. "Gratis," meaning free or without payment, is the correct answer.

The fact the teacher moved between town is the key to finding the answer. The correct answer will indicate the teacher's travels. "Itinerant," meaning nomadic or moving around, is the best fit among the answer choices.