The general idea of the sentence is that nobody can find a direct relationship between the two events. That is, they could not ascertain how the correspond to each other. When two things correspond, they have a very close connection. You can think of them "responding to each other." For the second blank, all we can really say is that the scientists continued to work in hopes of discovering this relationship. Thus, the word "labor" is an excellent option for the second blank.

“Abase” means to hurt the pride of or degrade. “Destitution” means to be in utter poverty. "Placate," which means to stop from being angry, in conjunction with “want” seems to be a reasonable solution until we consider the part about how feudal lords “stepped on” medieval serfs. This leaves “abase . . . destitution” as the only correct answer.

“Equanimity” might seem like a word that would fit well with government planning, but it doesn’t work in this case since it refers to being balanced emotionally in times of stress. “Abeyance” means a temporary cease or halt to something. “Amended” means to alter by formal procedure. “Abeyance . . . amended” is the only correct answer.

If the answer choice with “neophytes” looks tempting, remember that “neo-” means new. A “neophyte” is a beginner, new to a particular activity, which is the same definition for a “tyro.” An “acolyte,” on the other hand, is a follower. “Abominate” means to regard with loathing. “Abominated . . . acolytes” is the correct response.

“Expurgation” means to purge or cleanse moral offensiveness, so it doesn’t really apply here. From the answer choices, there is only one combination that fits. “Ablution” is a washing of oneself for hygienic or religious purposes. “Disperse” means to scatter. “Ablution . . . dispersed” is the correct answer.

Since there is a sentence shift after the word “however,” we can assume that the general public normally don’t help afflicted animals who are homeless. “Demur” means to object or show reluctance. An “abscess” is an area of pus surrounded by inflamed tissue. Together, these form the correct answer.

If tempted to pick “jettisoned,” know that its definition is cast aside or throw away. The key to selecting a word for the second blank is to read the entire sentence. If the former bank teller had left with an “astronomic” or “prodigious” amount of money, it would make sense that the story would be on national news. Since the act left people “scratching their heads,” the only correct answer must be “absconded . . . modicum.”

The most basic word that you might choose for the first blank is "admitted." This is the general meaning, and it provides a good place from which to start. The word "conceded" means to admit that something is true. In this case, the professor is offering a concession, namely, that the question is legitimate. (Of course, this is not the same thing as saying that the professor was wrong.) The second blank hints that the matter would have to be decided upon another time. The word "adjudicated" means just this. It comes from roots that are clearly related to "to judge."  An "adjudication" either such an act of judging or the very judgment itself. (Hence, we can say that a judge hands down an adjudication on such-or-such a matter.)

Clearly, from the sentence's own words, the storm did cause damage. It seems, however, that it did not cause a lot of damage, such as to really prevent travel in the area. Hence, the word "havoc" is the best option among those provided, as it expresses this idea of causing a lot of damage, not merely some damage. The second blank is completed well by the word "hamper," meaning to obstruct or make more difficult.

The most basic meaning of the sentence is the best one for this question. Mark does not seem to have been open to the proposal at first. When someone is "amenable," he or she is willing to go along with something that is proposed to him or her.  Eventually, it seems that Mark "gave in," however. The word "acquiesced" comes from the same root as "quiet." Someone who "acquiesces" can be said to go in quietly—to give in to the proposal in the case of this sentence.