The prefix "mono-" means one, so the word “monotone” means having only one tone. Of the answer choices, it is closest in meaning to “unchanging” which means not changing, staying the same. To provide further help, “variable” means differing; “gullible” means easily tricked; “resolute” means determined; “unifying” means bringing together. 

"Ample" is an adjective that means "enough or more than enough; plentiful." So, "meager" cannot be the correct answer, because "meager" means "lacking in quantity or quality" when used to refer to something provided or available," making "meager" an antonym of "ample," not a synonym." "Profuse," however, is an adjective that means "exuberantly plentiful; abundant, especially when used of something offered or discharged." Because "profuse" is the answer choice closest in meaning to "ample," "profuse" is the correct answer.

“Ample” is an adjective that means “plentiful,” so we need to pick out an answer choice that means something like “enough” or “plentiful.” That means that “lacking” cannot be the correct answer, because “lacking” means “not available,” making it an antonym, not a synonym, of “ample.” “Abundant,” however, is an adjective that means “large quantities; plentiful,” and because “abundant” is the answer choice closest in meaning to “ample,” “abundant” is the correct answer.

"Elephantine" means elephant-like, or in other words, extremely large. While elephants produce ivory and are said to have good memories in popular culture, neither "ivory" (off-white) nor "memorable" (significant or easy to remember) is a synonym of "elephantine."

"Solitary" shares its roots with words like "sole" (only, alone) and "solo" (a musical piece performed by one person alone or as a part of a group performance). Given that these other terms each have to do with being by oneself in some way, it's not surprising that "solitary" means done alone or living alone, making "alone" the best answer choice. As for the other answer choices, "paired” means matched up with another; “imaginary” means not real, and instead created in the mind; "communal" means available for the use of anyone in a certain group; and "written" means conveyed in text.

"Minuscule" means "tiny." As for the other answer choices, “gigantic” means very big, and is an antonym of "miniscule." “Talkative” means chatty; “reserved” means not loud or social, quiet and liking to be alone; and “silent” means not making any noise.

The word "towering" is indeed related to the well-known word "tower." Obviously, towers are known for their height. They are quite tall buildings. Now, while they are often built in cities, the word "towering" is not synonymous with being "urban" or city-related. Instead, the word "towering" is an adjective merely meaning very tall. Thus, the word "lofty" is the best, for this can be used to describe something that is very high.

When something is regular, it happens in a pattered way. If water is dropping in a regular manner from the ceiling, this means that it drops in a way that is predictable. If the bus always comes at the same time every day, it has a regular pattern and schedule. This kind of thing can be boring, but the word "regular" does not indicate boringness.  It indicates this kind of predictability. The word "uniform" means "having the same appearance." In school, if you have uniforms, this means that all of the students look the same. A "uniform pattern" is a regular pattern. Thus the word "uniform" is the best option among those provided.

The word "spacious" does have to do with space—physically open space, that is. When a room is "spacious" it has a lot of room in it. Thus, the word "roomy" is just fine as a synonym. Don't be tricked by the options that try to get you to pick something that deals with "outer space." We call it "space" because of all the empty room outside of planets and stars. (Hence, we can say, "Outer space is spacious," but "spacious" does not have anything to do directly with stars and other things like that.)

All of the options given here are about different kinds of "pieces" that we can have of something. A "chunk" of something, however, is a decent sized block. It is neither a sliver nor a mere "section." A chunk of cheese would be a little block of cheese, broken off the larger piece of cheese.