"Solitary" means lone, alone, or by oneself, so "lone" is the correct answer. To help you, "paired" means put together into a group of two, "guardian" means defender, and "luxurious" means fancy and expensive.

When something is "unique," it is the only one of its kind, or at the very least extremely special. For example, people often talk about snowflakes as examples of uniqueness, stating that each snowflake is slightly different. "One-of-a-kind" is the correct choice here. "Commonplace" and "regular" refer to ordinary things, so these words are the opposite of our answer. "Young," which means having so far only been alive for a brief period of time or not old, is an unrelated concept.

"Peculiar" is an adjective that means unusual. Therefore, the word "strange" is the correct choice; other synonyms might include odd or abnormal. "Normal" is an antonym of "peculiar," and "intelligent," or smart, is unrelated. "Uninteresting" is also an incorrect choice because a peculiar object is unlikely to be boring.

Immense means massive, huge, or very significant. To further help you, it is an antonym of the other four answer choices, as it has the opposite meaning to them. Miniscule, petite and lilliputian are all synonyms that mean very small.

"Puny" means weak and small. To further help you, "dazed" means stunned, especially by a blow; "bemused" means confused and puzzled. 

"Common" is defined as not rare. "Normal" is the best answer choice, because "normal" describes things that are standard, regular, or natural. "Rare" is an antonym of "common."

"Minuscule" is an adjective that means extremely small. So, the answer choice closest in meaning to "minuscule" is "tiny," an adjective that means very small. None of the other answers are close in meaning to "minuscule": "gigantic" is an antonym of "miniscule" and means very large; "opaque" means not transparent; and "magnificent" means impressively beautiful.

“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."