“Mars” is a planet in our solar system, so “Mars” orbits the “Sun.” This means that “Mars” goes around the “Sun.” So, to solve this analogy, you have to determine which of these answer choices orbits “Earth.” The correct answer is that the “Moon” orbits, or goes around, the “Earth.”

"Peak is to bottom" compares two words that describe opposite ends of an object, its the highest and lowest points, so the two words have opposite meanings and are antonyms. "Large is to small" describes the relative size of two objects, not relative positions on them or sides of them. "Grade is to homework," and "tame is to domesticated" do not describe the highest and lowest point of an object or consist of pairs of antonyms. Both "top is to base" and ""flat is to bumpy" consist of pairs of antonyms, but only "top is to base" describes the highest and lowest points of an object, so it is the better answer choice and the correct answer.

A nursery is somewhere where babies are looked after and learn. So, to solve this analogy, you have to determine who goes to a "classroom" to learn; the correct answer is therefore "student."

The word "secondary" refers to something that happens second, the second in a list of something. So, to solve this analogy you have to determine which one of these words means something that happens first, the first in a list of something. The correct answer is therefore "primary." To provide further help, "humorously" means done with humor; "universally" means by everyone, always relevant; "tertiary" means happening third; "unnaturally" means done unusually, done in a way that is not natural or normal. 

The sport of swimming is done in a pool. The sport of running takes place on a track. While it is possible to run places other than a track, it is the most reasonable answer provided. Swimming and running are both exercise activities, while work would be related to an office.

A "whale" is a large animal found in the "ocean." So, to solve this analogy you need to determine where a "comet" is found. Well, a "comet" is a relatively small object found in space that orbits the sun. So, the correct answer is "space."

The edge of "land," where the "land" meets the ocean, is generally called the "coast." So, to solve this analogy you need to figure out which of these words means something like the place where one nation ends, the line that divides one nation from another nation. The correct answer is "border." To help you "nation" is basically another word for "country." 

"Pandas" are from "China," so to solve this analogy you need to figure out where it is that "kangaroos" are from. The correct answer is "Australia." Additionally, "leap" means to jump high or far.

A "kiss" is an action of "love." So, to solve this analogy you need to determine which of these is an action that might be undertaken by someone who "dislikes" someone else. The correct answer is "insult" which means say something mean or bad about/to. Additionally, "praise" means compliment, say something nice about; "respire" means breathe; "assist" means help.

Since an astronaut flies a space shuttle as part of his or her profession, we need to find a relationship where an individual uses a particular vehicle as part of his or her profession. Since only a firefighter would use a fire truck as part of his or her profession, the answer is "firefighter is to fire truck."