The suffix -onomy usually means the study of, and the prefix astro- means related to space, so “astronomy” is the study of space. To solve this analogy you need to determine what “gastronomy” is the study of. The prefix gastro- means related to food or digestion, so “gastronomy” is the study of food.

An “autocracy” is a government ruled by one man, a government ruled by a dictator. A “dictator” is someone who has absolute control over a group of people. The prefix auto- usually means self, and so an “autocracy” is rule by one-self. The prefix dic- means say, command, so a “dictator” is someone who says and commands the rules of a country. To solve this analogy you have to determine what system of government an “oligarchy” is, and also who would be likely to run the government. The prefix olig- means few, or little, so an “oligarchy” is rule by a select wealthy few. This tells us that an “oligarchy” is ruled by “aristocrats.” If it was not yet clear, the suffixes -crat and -cracy mean rule, power. To provide further help, a “monarch” is a king or queen; a “representative” is someone tasked with representing the will of the people in government; a “technocrat” is someone who rules through technology.

The root "anthro-" means related to mankind and the suffix "-ology" means the study of, so “anthropology” is the study of man. To solve this analogy, you have to determine what “climatology” is the study of. The correct answer is "climate." None of the other answer choices make sense in the blank as they have nothing to do with climate.

The suffix "-meter" means related to measurement. A “barometer” is an instrument used to measure pressure, since the prefix "bar-" means related to pressure. To solve this analogy, you have to determine which of the answer choices is the name of an instrument that measures temperature. The correct answer is a “thermometer"; if you did not know this, you could use the prefix "thermo-" as a context clue, as "thermo-" means having to do with heat and temperature. To provide further help, an “odometer” is the instrument found in a car that measures how many miles the car has travelled; an “altimeter” is an instrument that measures height; a “micrometer” is a device that measures very small distances; an “audiometer” is a device that measures the loudness of noise.

The suffix -phile means love and the prefix Anglo­- means related to England or the English. So Anglophile describes someone who loves the English. To solve this analogy, you have to determine which country a Grecophile loves. You might have guessed, based on the first few letters, that the correct answer is “Greece.” It is Greece, the country, not Greek, the nationality, because the word "England" was used in the first comparison, not "English."

The suffix "-phile" means lover of and the prefix "bibl-" means related to books, so we can see that “bibliophile” means a lover of books. To solve this analogy, you need to determine what a “zoophile” is a lover of. The correct answer is “animals.” The prefix "zoo-" means related to animals, so whenever you see it in a word, it is reasonable to assume that the word will have something to do with animals.

“Introvert” and “extrovert” are antonyms; they are complete opposites of each other. We can tell this from their prefixes, "intro-," which means having to do with the inside of something, and "extro-," which means having to do with the outside of something. An “introvert” is someone who keeps to themselves, while an “extrovert” likes to be outgoing. This tells us that we should look for the opposite of “underpopulated.” The opposite of "under-" (not enough) is "over-" (too much), so the answer is “overpopulated.” Similarly, “depopulated” means the opposite of “repopulated” just as “unpopulated” means the opposite of “populated.” To help, a place which is “populated” has people living on or in it; for example New York is populated.