"Innocuous" is an adjective meaning innocent and harmless. For example: "The innocuous bull snake is often mistaken for the deadly rattlesnake."

"Invariably" is an adverb meaning always.

"Conglomerate" is a noun meaning distinct items that can be put together make a whole with distinct parts. A space station might be an example of a conglomerate.

"Vaccine" is a noun meaning a substance that makes the antibodies which inoculates a person against disease.

"Indicate" is a verb which means to point out or to show.

"Harmless" is an adjective which means innocent and inoffensive. Harmless has the most similar meaning to "innocuous."

“Lax” means negligent, not giving enough attention to something, or not taking something seriously enough, so "negligent" is the best synonym amongst the answer choices. As for the other answer choices, “odious” means unpleasant, revolting, or disgusting; “prolific” means able to produce a large quantity of something quickly; “tedious” means dull and boring; and “remorseless” means not feeling guilty about one's actions.

“Bleak” means desolate, bare, lifeless, and depressing. A situation can also be “bleak,” which means hopeless. As for the other answer choices, “fertile" can mean able to produce lots of vegetation and crops; "abundant" means found in large numbers; “perceptive” means insightful, sensitive, and noticing many things; and "flagrant" means overt and brazen and is often used to describe instances in which someone purposely breaks rules.

To "abhor" something is to loathe, despise or hate it. You might "abhor" violence and refuse to watch TV shows that promote violence. "Covet" and "desire" both mean to want something, so these are antonyms of abhor. "Instigate" means to start something and "enhance" means to make better.

"Combustible" and "explosive" mean the same thing; just as "pliable" and "flexible" are synonyms.

Clearly the words deny and affirm are opposites. When we deny an accusation, we refuse to admit that it is true at all. In contrast, an affirmation is a statement that something is indeed the case. Thus, the analogy is one of antonyms. The opposite of “accept” is “reject.” Though a rather simple answer, it is still the best option.

The word “potable” comes from the Latin word for “to drink” or “drinkable.” This latter sense still is retained in the English, as the word “potable” means either “drinkable” or “safe to drink.” When liquid is potable, it is free of any contamination. Thus, the analogy could be written, “As potable water lacks contaminants, so does something that is healthy lack X.” Among the options provided, only “disease” fits the needed sense of that which is lacking in someone who is healthy.

"Advance" is the opposite of "retreat," so therefore the opposite of "ascend" would be "descend," or to go down.

"Bitter" and "sweet" are antonyms, just as "pungent" and "mild" have opposite meanings.

"Lucky" and "fortuitous" mean roughly the same thing, just as "drab" is another word for "dreary."