A "crater" is a pit or depression in the surface of the earth (or another body in space, like the moon). Think about craters as resembling dents or scoops taken out of the ground. The word "hill" is the opposite of "crater," since it describes a geographical feature that extends upward from the ground, not downward. "Frown," an unhappy expression, and "mirror," a reflective surface, are unrelated terms.

A "talon" is the claw of a bird, so "claw" is the correct answer. "Retirement" is the period after a person stops working. A "protagonist" is the main character of a story. A "canyon" is a deep gorge. A "banquet" is a large dinner, usually held to celebrate some event.

"Apparel" means clothing or something you wear, so "clothing" is the correct answer. None of the other answer choices are close in meaning to "apparel": "satisfaction" means the fulfillment of one's goals or expectations; "selection" is the act of choosing something; a "university" is a place of higher learning; and a "result" is the final outcome of something.

"Speck" is a noun that means a tiny spot or particle. The only answer choice that has a similar definition is "fleck," meaning a very small particle or patch of light. One definition of "weight" is a heavy object. A "surge" can refer to a sudden powerful movement. A "tract" can mean a large area.

An “antibiotic” is a substance that kills bacteria and so is used as medicine. The prefix "anti-" means against or negating something, and the suffix "-biotic" means having to do with life, in this case, bacteria. Along with “viruses,” “bacteria” are the primary agents by which disease is spread. However, it is worth nothing that there are a great many number of bacteria in our bodies that help us a great deal.

The suffix "-cade" means procession or parade, so the word “motorcade” means a procession of cars. To provide further help, an “abyss” is a bottomless pit, a hole; “barrage” is a rapid and repeated attack; a “conflict” is a disagreement; “implication” means suggestion. 

The word "banquet" is likely very familiar to you. You likely have been to some banquets at the end of the year for various groups (sporting, scouts, or something else). Such meals are often marked to celebrate something—a successful season, devotion to the scouting way of life, etc. They are celebratory and often large. They are not simple meals, like dinners or suppers. Likewise, even though they might be buffet-style, that is only by chance. (Often it is easier to have a big banquet by providing the food in a buffet line.) A "banquet," strictly speaking, is a large meal, generally formal, and extraordinary in character. (It is generally combined with awards, speeches, and so forth.) The best option among those provided is "feast," which is used to name a meal that is special and large in character.

A "sanctuary" is a place of safety or refuge, especially when surrounded by an unsafe environment. Similarly, a "haven" is a place of security, so "haven" is the correct choice. Just to be thorough, let's look at the rest of the choices. "Peril" is synonymous with danger, so it conveys the opposite of safety. As you might be able to tell by dissecting the word, "companionship" refers to the state of having a companion or friend. Finally, "opacity" is derived from the word "opaque," which describes materials that are not transparent or "see-through." Hence, opacity means impermeability to light and has nothing to do with "sanctuary."

"Terrain" is land. "Land" is the best choice because it is a part of the definition of the word "terrain."

The prefix "spec-" means to see or to look at. A “specimen” is an example to look at. In this sense, it is closest in meaning to “sample.” To provide further help, an “integer” is a number; “fusion” is a process of joining things together; “dogma” is an established belief system; “refractory” means stubborn or disobedient.