If something is colossal, it means that it is massive or immense. For example, a mistake can be colossal if it is large.

"Immense" is an adjective that means "extremely large or great, especially in scale or degree." So, we need to pick out an answer choice that means something like "very big." That means that "puny" can't be the correct answer, because "puny" means "small and weak" or "poor in quality, amount, or size," so "puny" is an antonym of "immense." "Gargantuan," however, is an adjective that means "enormous," so "gargantuan" is the correct answer because it is the answer choice closest in meaning to "immense."

“Diminutive” is an adjective that means “extremely small,” so we need to pick out an answer choice that means something like “very small.” That means that “enormous” cannot be the correct answer, because “enormous” means “very large in size, quantity, or extent,” making it an antonym, not a synonym, of “diminutive.” “Minute,” however, is a word that means “extremely small” when used as an adjective, and because “minute” is the answer choice closest in meaning to “diminutive,” “minute” is the correct answer.

"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.