"Internal" means on the inside, so "inside" is the correct answer. "Exterior" means on the outside. "Accessible" means able to be reached. "Confident" means self-assured. "Visible" means not hidden and able to be seen clearly.

The prefix "mis-" means done wrong or badly, so something that has been “misplaced” has been placed incorrectly. This is closest in meaning to “lost.” To provide further help, “limpid” means clear; “morose” means very sad and serious; “supreme” means best or highest; “searched” means looked for. 

"Appropriate" means suitable or proper for what is going on. Fitting also means suitable or correct for a situation, so "fitting" is the correct answer. As for the other answer choices, to "fumble" something means to use one's hands in a clumsy manner while doing something, "queasy" means feeling sick or ill to one's stomach, "entire" means whole or with no parts missing, and a "chamber" is a large room.

The word "impersonal" is made up of two parts: "im" and "personal." The "im-" prefix is a form of the "i-" prefix that means not. To be "impersonal" is to be "non-personal." Now, that seems a bit strange at first sight. However, to be "non-personal" means that something does not show the kind of individual characteristics that a person would show. For instance, a "personal" letter is one that is written directly for someone else, often containing things that show that the letter writer knows the person to whom he or she is writing. However, an "impersonal" letter is one that is written without really paying attention to its receiver. We receive these kinds of "impersonal" letters in the mail when we get something from a company telling us about new services. (Many other examples could be provided, of course!)

The best option among those provided is "formal," which means following a given way of acting, or in other words, following a given form of acting. This implies that someone or something is not "particular" (as would be something "personal"). Instead, it follows a given "form" that can be applied to anything or anyone whatsoever.

Indigenous is defined as innate and inherent, which makes it natural. 

In terms of something that is remote such as a remote island, it means that it is distant.

Something that is "systematic" occurs as the result of a system or plan that has been put into play. Something that is "systematic" is thus "efficient" becauase it has been planned out to be as useful and direct as possible in achieving its results.

"Vacant” means empty or unoccupied, so "empty" is the correct answer. As for the other answer choices, “meaningful” means important and significant; “insignificant” means not important; “quirky” means unconventional.

"Maritime" is an adjective that means "connected with the sea, especially in relation to seafaring commercial or military activity," "living or found in or near the sea," "bordering on the sea," or "denoting a climate that is moist and temperate owing to the influence of the sea." While "wet" might look like the correct answer because both "wet" and "maritime" can be associated with water, "wet" does not mean the same thing as "maritime" and cannot be the correct answer. "Nautical," however, means "of or concerning sailors or navigation; maritime," and because it is the answer choice closest in meaning to "maritime," "nautical" is the correct answer.

The adjective "prior" indicates that something comes before another thing. For instance, if you already have some knowledge of frog anatomy when your class begins to cover this subject, your biology teacher could say that you have "prior knowledge." The word "prior" is opposed to the word "posterior," which means coming after. A "prior commitment" is a commitment or meeting that you have scheduled at an earlier point in time. While things like "prior knowledge" might be simple in comparison with later developments of that knowledge, the best option among the answers is the one that draws attention to the general notion of being "before." Hence, "preceding" is the best option, for "preceding" means coming before.