"Big and small" discuss the size of something, with the larger description first and the smaller one second. The only choice that matches this is "Wide and narrow."

Appearance is an opposite, or antonym, of disappearance, which you can infer from the negative prefix "dis-" in "disappearance." An "appearance" is an instance of someone or something showing up, while a "disappearance" is an instance of someone vanishing or not being able to be found. So, to solve this analogy, you have to determine the best antonym of "champion." A "champion" is a winner, so the answer choice that is an antonym of "champion" is “loser.” As for the other answers, "vanish" means disappear suddenly, but we need to pick out a noun for the blank, because "champion" is a noun. So, "vanish" cannot be the correct answer. "Victor" means champion, but because "appearance" and "disappearance" are opposites, not synonyms, we need to pick out an opposite, or antonym, for the blank. So, "victor" cannot be the correct answer either. "Match" and "win" are each words that can be used as nouns and can be used to describe competitions which might choose a "champion," but neither word is an opposite of "champion," so neither of them can be the correct answer.

"Rare" means difficult to find or not often occuring, and "common" means easy to find or occurring often. So, "rare" and "common" are opposites, or antonyms, and you need to pick out an answer choice that is an antonym, or opposite, of "fun." "Boring" is an opposite of "fun," so "boring" is the correct answer. As for the other answer choices, "pleasant" means enjoyable or nice and isn't the opposite of "fun," "unique" and "unusual" mean the same thing as "rare," and "everyday" means the same thing as "common."

Both sets of words are antonyms. 

Since "messy" is the opposite of "organized," we need to pick out an answer choice that is the opposite of "awake." While "asleep" and "tired" may both look like potentially correct answers, "asleep" is the better answer, because the opposite of tired would be a word like "energetic," not "asleep." Since "asleep" is an antonym of "awake," just like "messy" is an antonym of "organized," "asleep" is the correct answer.

"Love" and "hate" are opposites, meaning that they are completely different from each other. An "enemy" is someone with whom there is antagonism, while a "friend" is someone with whom there is a shared closeness. Therefore, a "friend" is the opposite of an "enemy." Hence, "friend is to enemy" is the correct answer.

"Wide" and "narrow" are opposites, or antonyms, so you need to pick out a word that means the opposite of "brief." "Brief" means lasting for a short amount of time, or short when referring to a written work. So, the answer choice that means the opposite of "brief" is "lengthy," which means lasting for a long time, or long when referring to a written work.

Someone who is "harsh" is not kind, so, to solve this analogy, you have to determine which of these answer choices is the antonym (which means the opposite) of "repulsive." "Repulsive" means disgusting or pushing or driving things away, so the best antonym is "attractive," which mean pretty or appealing.

"Distracted" and "attentive" are antonyms. "Grimy" means dirty, and the opposite of dirty is "clean."

"Safe" and "risky" are antonyms, so the answer must be an antonym of "bravery." "Courage" and "daring" are synonyms of "bravery," and a "daredevil" is someone who may show bravery. A "genius" has nothing to do with the word "bravery." "Cowardice" is the only antonym of bravery.