When something (like light) is "emitted," it means that it is given off. So, "give off" is the correct answer.

"Impale" means pierce with something pointed, so "lance," which means pierce, is the best choice.

"Expedite" means to speed up the process or progress of, so the best choice for a synonym is "hasten," which means speed up or go somewhere quickly.

The word "decimate" means destroy. The best choice is "obliterate" because it means completely destroy. Considering the other options, "dice" means chop up into cubes, "amass" means gather, and "cavort" means act merily or prance about.

The word "juxtapose" means to put two things next to each other or combine them in order to highlight a certain difference between them. The best choice is "contrast" as it means consider the differences between two or more things. Considering the other choices, "justify" means show to be right, "put" means place, and "judge" means decide.

"Encumber" is a verb that means burden. To "encumber" someone means to put a burden upon him or her. To help you, a "burden" is a physical or metaphorical load that is difficult to carry. To help you further, "calamity" means disaster, "desolate" means bleak and isolated, and "repurpose" means find another use for. 

To "recuperate" means to recover or regain health and energy after exerting oneself or being ill, so "recover" is the correct answer. To "iterate" means to reoccur or to repeat. To "disunite" means to separate or break up, as you might have been able to guess from the word being a combination of the negative prefix "dis-," which means to do the opposite of, and "unite." To "yearn" means to strongly desire or want. To "eradicate" means to destroy or remove completely.

To "recuperate" is to recover from an illness or injury, so "recover" is the correct answer. None of the other answer choices are close in meaning to "recuperate": to "supplement' is to add something helpful but not necessary to something else; to "refine" is to improve something by removing impurities from it; to "cease" is to stop; and to "decline" is to lessen.

When something, such as a wave, "subsides," it means that it lessens in intensity; therefore, the best answer choice is "weaken," which is synonymous with lessening in degree or force. "Reinforce" is to strengthen; "appease" is to calm; "fortify" is to strengthen; and "eliminate" is to completely remove.

“Gnaw” means to chew on something large and tough without swallowing it, so "chew" is the correct answer. As for the other answer choices, “devour” means eat greedily or use up; "prohibit" means ban or not allow; "snap" can mean break into two pieces or click one's jaws at in an attempt to bite, and this second usage usually refers to animals; and "chase" means pursue or follow at a fast pace something or someone that does not want to be caught.