Since the sentence does not indicate any specific means by which the water was being supplied, the best option will be the one that is most general, only implying the general function of “carrying water.”  The word “aquifer” is derived from Latin roots literally meaning “water carrying.”  The “aqui-” portion clearly indicates water as is evident in related words like “aquarium” and “aquatic.”  The “-fers” portion comes from the base for “to carry,” found in “differ” (lit. to carry away from something else) and “transfer” (lit. to carry across).

The specific sense that we are looking for in our word is that of forgiveness and mercy.  While Albert’s act is perhaps pious and generous, it most certainly is “clement,” a word meaning “lenient or merciful.”  When we say that there is “inclement weather,” we generally mean that it is particularly nasty, as though it were unforgiving.

Clearly, the mother in question is neither stealing nor succeeding to the throne.  However, insofar as she is ruling, she is doing so as a replacement for the king.  A person filling such a role is called the “regent.”  Such regency is undertaken in any case where the normal ruler is not fit to assume responsibilities (e.g. because of age, illness, or perhaps being off at war and out of communication).  The word is related to the Latin “regere,” meaning “to rule.”  Related words in English include “regal,” “reign,” and “interregnum.”

A number of the options presented as answers to this question are tempting, as they seem to apply to the case of the textbook being considered. Certainly, the new textbook would represent or declare the scientist’s work. These are all insufficient, when one notes the key expression, “after forty years.” The implication is that the textbook is the summary or “high point” of a long process of work. A “culmination” is the pinnacle or high point of some process, often implying that such a process took significant time to complete. It comes Latin roots meaning “summit.”

A “reverie” is a state of daydreaming.  When the term is used to describe a type of music, it implies that the music is meant to invoke the feeling of such a dreamy state.  The other options either exceed the implications of the sentence (“dementia” and “lunacy”) or do not capture this sense of dreaming (“discussion” and “discourse”). 

The key thing to note in reading this sentence is that the shirt is functioning to stop bleeding at its source. Although a bandage or strap might do this, a tourniquet is the best choice because this is explicitly a device used for stopping the flow of blood by constricting the vessel through which it is flowing.

Here, it is necessary to know the meaning of “précis” in order to be certain about the necessary meaning of the needed word. Strictly speaking, a précis is a summary of some longer text. It is not necessarily superficial or reductive in its presentation of the longer source. It merely provides a short summary. Therefore, the best option for our sentence is “succinct,” which means brief in form or expression. It is derived from root words that mean “encircled.” The word “cincture,” meaning a belt, is an example of another related word.

The teenagers, in looking to escape persecution, are seeking a place of safety. Such a place would be a “haven,” a word that we often see in the combined expression “safe haven.” The word can also be used to indicate an inlet or port at which ships can dock.

When an organ enlarges because of an increase in cellular size, it is said to undergo hypertrophy. This word is derived from a prefix that likely is familiar, “hyper,” and a base “trophy,” that is perhaps not as familiar in its root meaning. “Hyper” means “above” or “beyond,” as found in words like “hyperbole,” “hyperactive,” and “hypersensitive.” The “trophy” portion is derived from the Greek “trophe,” meaning “nourishment.” Something that is “hypertropic” is “over-nourished” in the sense of having too much fluid and material within its cells.

Since Susanne could barely function as a human being, she would most exactly be considered an “invalid,” a word indicating a person who has been disabled from injury or illness. Literally, the word means “lacking strength.” The “-valid” portion comes from root words related to the notion of strength, as found in other English words like “valor,” “valid,” and “prevail.” Do not be tempted to choose “comatose.” First, there is no direct indication that she has been put into a coma. Secondly, the form of the word does not fit in the sentence, as “comatose” is an adjective that really cannot be used substantively as a noun (as is needed in this sentence).