“Substantial” means large, significant, and extensive. To provide further help, “miniscule” and "petite" are synonyms and both mean very small. "Aggressive" means violent and destructive and is an antonym of “passive,” which means peaceful and calm. "Passive" can also be used to mean weak or easily dominated.

"Immense" and "colossal" both mean very large, so "colossal" is the correct answer. As for the other answer choices, "microscopic" and "miniature" both mean very small, though "microscopic" means so small as to need a microscope to be seen and "miniature" means being a smaller version of something else. "Intermediate" means of a difficulty between easy and challenging.

"Compact" is a word that when used as an adjective can mean "closely and neatly packed together; dense," or "having all the necessary components or features neatly fitted into a small space." So, we need to pick out an adjective that means something like "small." That means that "oversized" can't be the correct answer, because "oversized" can mean "bigger than the usual size," so "oversized" is an antonym of "compact." "Miniature," however, is an adjective that means "of a much smaller size than normal; very small," especially when used of a replica of something, so "miniature" is the correct answer because it is the answer choice closest in meaning to "compact."

The word "portable" means easy to carry and transport from place to place. The best choice is "lightweight" because it is a characteristic of something that is portable and can be used as a synonym of "portable." Considering the other options, "big" is an antonym of portable because something that is big is not able to be carried easily. "Bag" and "toy" are both examples of things that can be portable.

Assorted means made up of various types of things. To further help you, a concept is an idea; the wilderness is the wild; metropolitan means a large city area; circumstantial means because of a situation, lucky.

"Sparse" means scarce or not abundant. "Scant" similarly means scarce or not abundant, so "scant" is the correct answer. As for the other answer choices, a "concept" is an idea, a "duplicate" is an exact copy and to "duplicate" something means to make an exact copy of it, "thrifty" means using what you have carefully and not wasting anything, and "nonchalant" means calm and unconcerned about something.

When something is "becoming scarce," it is decreasing in quantity. Indeed, a "scarce" supply is one that is scanty or small in quantity. If almost all the trees in a forest are cut down, we would say, "The trees have become scarce." Therefore, the word "scarce" at times is used to mean "rare" as well. If there are few trees, it becomes rare to see them. A "rare occurrence" is one that does not happen very frequently—it "scarcely happens."

When you have an "abundance" of something, you have a lot of that thing. The word "abounding" means overflowing or in a great quantity. Therefore, "abounding love" means a great amount of love—to the point of overflowing. The best answer is "plentiful," which expresses having a great amount. To say that you have "plenty of corn" is to say that you have a lot of corn. Note, however, that while a fruitful harvest is indeed "plentiful," it does not mean exactly the same thing as "abundant." "Fruitful" means producing a lot or productive, so while "fruitfulness" is a kind of "abundance," is not the same as "abundance" or "abundant."

"Meager" refers to amounts of things and means a very small or too small. "Sparse," which means present only in small amounts or less than is necessary, is the best match.

"Maximum" means most or greatest possible, so "greatest" is the correct answer. None of the other answer choices are close in meaning to "maximum": "meager" means insufficient or not enough; "minor" means relatively small or relatively unimportant; "drastic" means extreme or radical; and "cordial" means friendly and pleasant.