The prefix "e-" can mean away or out and the "-ject" portion of the word derives from the Latin for "throw," so it makes sense that "eject" means throw away from. That makes "discharge" the correct answer, as "discharge" means toss away from. Considering the other answer choices, "reward" means give someone something nice for doing the right thing; “reproach” means show that one does not approve of something; “distress” means cause to become upset; and “vend” means sell.

In the word "dismiss," the "dis-" prefix is functioning to mean away, and the "-miss" portion derives from the Latin for to send, so it makes sense that "dismiss" means send away or ignore. "Ignore" is thus the correct answer. Considering the other answer choices, “demand” means ask for forcefully as if the person being queried has no other choice; “question” means ask or cast doubt on; “introduce” means bring something up, like an idea or a person, for the first time; and “conclude” means determine or finish.

The prefix "inter-" means between, so it makes sense that "interact" means engage with another person, talk, or "communicate." As for the other answer choices, “undermine” means subvert, sabotage, or work against the progress of; “trade” means exchange goods; “calculate” means figure out or determine; and “portray” means show or represent.

The prefix "a-" means not and negates the original meaning of a word. “Symmetrical” means having two halves that are mirror images of one another, so “asymmetrical” means not having two halves that are mirror images of one another. This makes "uneven" the best answer choice. As for the other answer choices, “resourceful” means capable and able to cope with many situations; “balanced” means even; “international” means global or having to do with multiple nations; “outdated” means out of date and obsolete.

Animals that eat both other animals and vegetables are called “omnivores.” “Carnivores” eat only meat and “herbivores” eat only plants. The prefixes "omni-" (all) herb- (having to do with plants), and carn- (having to do with the body, flesh, or meat) are all relative here. A “deity” is a god or goddess; and “omnipotent” means all-powerful.

The prefix "re-" means back or again, and "pel" derives from a Latin root meaning force, so it makes sense that "repel" means force back, deflect, or "repulse." “Summon” means send for or call for; “beckon” means wave for someone to approach; “command” means order or tell what to do; and "intrude" means interrupt, often by entering a space in which one's presence is not desired.

The prefix "im-" means not, and the Latin root "mort" means death, so it makes sense that "immortal" means not mortal, or not able to die. This makes "eternal," which means lasting forever, the correct answer. As for the other answer choices, “effortless” means not requiring effort or done with such skill as to make look extremely easy; “laborious” means difficult and involving hard work; "inconclusive" means not supporting any definite conclusions; and "frequent" means occurring often.

"Ob-" is a prefix that often means against, and "-ject" derives from roots that mean throw. (Other English words that include "-ject" include "inject," "subject," "project," and "reject.") So, it makes sense that "object," when used as a verb, means argue against something and prevent it from proceeding. Conversationally, "objecting" to something is like "throwing yourself" against it to try to stop it or prove it wrong. The word is often used in court when someone wants to stop the proceedings because he or she disagrees with what has been said or how something has been said. "Oppose," which means be against and dispute, is thus the correct answer choice.

As for the other answer choices, “theorize” means to think and suggest why something is; “project,” when used as a verb, means predict or protrude; “concur” means agree; and "falter" means momentarily pause, stumble, or have one's resolve shaken.

The prefix "co-" means together, "labor" means work, and the suffix "-ate" means make or do,  so it makes sense that "collaborate" means work together, especially on a project. "Cooperate," which also features the prefix "co-" and means work together without causing each other trouble, is thus the correct answer. As for the other answer choices, “conversation” is talking with another person; “training” means preparation or working to get better at something; and a “demonstration is an instance of showing how something is done by having someone do it; and "simplicity" is ease or the lack of complication.

The prefix "ob-" means against, so it makes sense that "obscure," when used as an adjective, means hard to understand or unknown, making “unclear” the best answer choice. As for the other answer choices, “certain” means sure; “assured” means confident, feeling calm and sure; “responsive” means reacting to stimuli; and “relevant" means pertaining to the subject of something or the matter at hand.