"Prevent" means to stop something from happening, so "stop" is the correct answer. None of the other answer choices are close in meaning to "prevent": "retreat" means to move back to a previous position in combat or withdraw; "fulfill" meets to satisfy some expectation; "quiet," when used as a verb, means to silence or make less noisy; and "breathe" means to inhale and exhale air using the lungs.

While "weather" is often used as a noun that means atmospheric conditions and phenomena, "weather" can also be used as a verb that means endure. So, "endure" is the correct answer because it is the answer choice closest in meaning to "weather." For clarification, "outlaw," when used asa verb, means to ban or to prohibit, and "exclaim" means to cry out.

"Eclipse" means to make less outstanding or important by comparison. "Surpass," which means to exceed or be greater than, is the right answer.

"Heed" means pay attention to or obey, so "notice" is the correct answer.

"Redress" most nearly means remedy (as a verb), as in "The prisoners were seeking to have their false convictions redressed."

“Quell” is a verb that can mean “to forcibly put an end to a rebellion,” “to subdue or silence,” or “to suppress a feeling.” So, we need to pick out an answer choice that means something like “end a rebellion by force,” “subdue someone,” or “suppress a feeling.” That means that “encourage” cannot be the correct answer, because “encourage” can mean “to give support and advice,” making it an antonym, not a synonym, of “quell.” “Suppress,” however, is a verb that means “forcibly put an end to” or “restrain.” So, because “suppress” is the answer choice closest in meaning to “quell,” “suppress” is the correct answer.

"Ratify" means approve and is usually used to refer to the passage of legislation. So, "approve" is the correct answer. For clarification, "emancipate" means to make free, "insolent" means rude, "reproach" means scold or tell off, and "insult" means verbally disparage.

"Aggravate" means make something worse. For instance, if you aggravate an injury, you do something to make the injury more serious. So, "worsen" is the correct answer. "Improve" is an antonym of "aggravate"; it means make something better. As for the other answers, "grow" means get larger, "shrink" means get smaller, and "produce" means make or yield.

Compensate, is a verb that means "to give someone something." Of the answer choices, the word with the closest definition is "reward".

"Obtain" is a verb that means "to gain or get something, usually by effort," we need to pick out another word that means "to get something." While both "procure" and "retrieve" involve getting something, "retrieve" means "to get and bring something back from a place," whereas "procure" means "to get something by some action or effort." Since "procure" is closer in meaning to "obtain" than is "retrieve," "procure" is the correct answer.