"Sheepish" means embarrassed or uncomfortable, so "embarassed" is the correct answer. None of the other answer choices are close in meaning to "sheepish": "swift" means rapid or quick; "energetic" means lively or having or showing a lot of energy; "sympathetic" means compassionate or understanding; and "flexible" means bendable.

"Miserable" means sad or unhappy, so "unhappy" is the correct answer. "Joyful" is an antonym of "miserable"; it means very happy or cheerful. "Lethal" means dangerous and possibly causing death. "Sturdy" means strong or robust. "Grimy" means filthy or dirty.

"Envious" most nearly means jealous, as in "Admiring the movie star's gorgeous looks, Lori felt slightly envious of her beauty."

"Sanguine" most nearly means cheery when faced with difficulty, as in "Despite the fact that his opponent had beaten him before, Gary remained sanguine about his chances of winning the race."

"Aghast" is an adjective that means stunned or horrified, so we need to find another adjective that means something that has to do with feeling shock or fear. While "ghastly" sounds like "aghast," it is an adjective that means terrible or shocking. Since "ghastly" does not mean the same thing as "aghast" ("shocking" doesn't mean the same thing as "shocked"), it can't be the right answer. "Alarmed," on the other hand, means frightened, and since it is the answer choice closest in meaning to "aghast," it is the correct answer.

"Contrite" is an adjective that means "feeling or expressing remorse or penitence; affected by guilt," so we need to pick out another adjective that means something like "feeling guilty." While "pennant" and "penitent" sound quite similar to one another, "pennant" is a noun meaning "a long, thin, pointed flag," while "penitent" is an adjective meaning "feeling or showing sorrow and regret for having done wrong; repentant." Because "penitent" is the answer choice closest in meaning to "contrite," "penitent" is the correct answer.

"Content" means satisfied or happy; Extensive means thorough; Important means relevant; Paltry means of small amount; and Enormous means huge.

"Lonely" describes someone who feels alone or is friendless, so "friendless" is the correct answer. "Popular" is an antonym of "lonely"; it describes someone who has many friends. "Talkative" is a synonym of garrulous and describes someone who talks a lot. "Joyful" means very happy. "Chaotic" means involving disorder or confusion.

"Avid" means enthusiastic, or being very eager and passionate about something.

None of the other words are synonyms of avid:

"Trivial" means not important.

"Rigorous" means intensive, demanding or difficult.

"Pompous" means having an annoying sense of self-importance or something that is excessively pretentious.

"Acidic" means the quality of having acid, or of being sour.

"Doleful" means "melancholy," sad, or depressing.

None of the other words are synonymous with doleful:

"Mediocre" means average or ordinary.

"Indomitable" means invincible, stubborn or unyielding.

"Deer-like" means related to a deer, or possessing qualities of a deer. Deer are often described as having doleful eyes.

"Elated" means wildly excited and happy, or euphoric.