The boy in the sentence received a "large cut" due to the missing word being on the glass. This means the correct answer will indicate something sharp and able to cut a hand. "Serration," meaning a jagged edge, is the best choice among the answers.

The sentence notes the "straight A student" got a "poor test score." The correct answer must therefore indicate the fact this score was unexpected. "Aberration," meaning a deviation from the normal, is the best choice among the answer.

The sentence contrasts the fact the "posse" knew he was "quite scared," with the "brave" missing word. The correct answer must indicate an appearance or look of bravery. "Facade," meaning the front facing of a building, here used metaphorically, is the best choice among the answers.

The sentence notes that "different groups" came together against the government. The correct answer needs to indicate a unification. "Monolith," meaning a united force or singular front, is the best choice among the answers.

The "hopeful members of the political party" are seeing earlier successes in this new campaign.  This means the correct answer will show they see the earlier campaigns are a model. "Analogue," meaning something similar or a corresponding happenstance, is the best choice among the answers.

The sentence notes the coach has made a "return from retirement," which is necessarily at the end of his "distinguished career." The correct answer will indicate an extra part of his career. "Coda," meaning the last part of a musical work, and used generally to mean a finale, is the best choice among the answers.

The sentence describes teachers being placed between "children who are fighting." Since they are teachers, it is safe to assume they are attempting to stop the fights. "Arbitrators," meaning a mediator or the judge of a dispute, is the best answer choice.

The sentence notes two key facts, that the groups are "throughout the country" and that they have made "law enforcement highly concerned." The correct answer needs to indicate that the "terrorist groups" are spreading and disseminating, the definition of "proliferation."

The plan resembles "previously failed approaches," which makes people question the aspect described by the missing word. The correct answer needs to describe the plan's ability or function. "Efficacy," meaning effectiveness or usefulness, is the best choice among the answers.

There are two great clues to the best answer in the sentence: "derogatory" and "to refer to her assistant." The missing word describes a term that can refer to someone in a derogatory manner. "Epithet," meaning an appellation or a shothand byword, is the best choice among the answers.