While the plaintiff's backtracking makes him look bad, the sentence is structured in a way that makes the correct answer need to mean "truthful" or "believable." Therefore, rule out "frivolous," "underhanded," and "conniving" immediately. "Credible," which means believable, is the choice that works best in the sentence.

Although one might want to say that Daniel’s activity was commendatory or something else of the like, the best fit for the opposition in this sentence would be a word that captures the sense of being “not egoistic.” The word “altruistic” does this, for it means that one is selflessly concerned about the needs of others. Often one uses the nominal form “altruism” to describe the characteristic as well.

The key word in this sentence is "betrayed," which indicates that the man's demeanor was at odds with his inner fury. The correct answer will therefore have a sense of calm or quiet, the very definition of "placid."

The university's collection is now suspect because of the discovery of real documents. The way the sentence is framed indicates the correct answer is an antonym of "real." "Counterfeit," meaning fake or inauthentic, is the only antonym of real among the answer choices.

The words “vexed” and “caustic” coupled with the phrase “even more” indicate that the answer choice will reflect similarly negative speech. Only "abrasive" works in this context.

The structure of the sentence, and the employees' surprise, indicates the new manager was not easygoing. The correct answer choice will be the one that is an antonym of "easygoing." "Abrasive," meaning harsh and coarse, is the only such answer choice.

When something is “lucid” it is clear and bright—like light. Indeed, the word comes from the Latin word for light, which is found in other words like "translucent" and "pellucid." To say that something is “labyrinthine” is to say that it is like a maze. The implication is that Hegel’s writing style is as difficult to read as a maze is to navigate. In contrast to this, Sokolowski’s style must have been clear—that is, it was "lucid."

The contrast here is with the word “bodies” in the first phrase, so do not go any further than that meaning if possible. While “invisible” and “hidden” are tempting options, “incorporeal” most directly answers to the need in this regard. It means not having a body. In this word, the prefix “in-” is a negative prefix meaning “not,” and the “-corporeal” portion is derived from the Latin for body. It is related to other words such as “corpulent,” “corpse,” and “incorporation.”

The main clue in this sentence is “no matter how small it might be.” The implication is that Scott’s gift was not very large, but it was nevertheless appreciated by the museum. When something is “substantial,” it is either of great importance or at least existing in a great amount. “Substance” can mean “matter” (as in “two chemical substances”) and it denotes a certain fixity as well. Thus, a “substantial” thing is important, like the solidity of matter (after a manner of speaking at least).

The contrast here is between excitement and what must be a rather detached and disinterested response from Timothy. When liquid is barely warm, it is said to be “tepid.” By extension, this becomes applied to persons to say that they are “lukewarm” or that they show little interest or passion for a given thing or things.