"Mischief" is a noun that means "playful misbehavior or troublemaking, especially in children," or "harm or trouble caused by someone or something." So, while "mistake" may look like a good answer choice because both "mischief" and "mistake" begin with the prefix "mis-", which means "wrongly," "mistake" does not mean the same thing as "mischief," so "mistake" cannot be the correct answer. "Trouble" is the answer choice closest in meaning to "mischief," so "trouble" is the correct answer.

An "aspect" is a feature or a part, so "feature" is the correct answer. A "document" is a piece of paper with information written on it, usually in words. An "option" is a choice or a possible selection. "Leisure" means free time or time off. An "emergency" is a sudden event requiring immediate attention.

A “skirmish” is a small fight or battle. A "wound" is a physical injury, so while you may receive a wound in a skermish, "wound" does not mean the same thing as "skirmish."

"Variety" refers to the presence of lots of different things in a group or assortment of something. "Diversity" is the quality of a collection of items, people, or abstract ideas including many different types. Given how similar the meanings of these two words are, they are synonyms, and "diversity" is the correct answer.

A ”gap” is a hole or empty space in something. The word “support” means help given to someone.

A “controversy” is a disagreement where two or more people do not think the same thing has happened. Often a “controversy” is something that breaks the rules. The word “punishment” describes what is done to people who do bad things and get caught. An “instinct” is something you feel or do naturally; a “declaration” is a statement, a saying, of something; and a “supposition” is the act of believing something that has no proof or such a belief.

“Squalor” is dirt or “filth"; someone who lives in “squalor” lives in very dirty or filthy conditions. The word “baggage” describes something you carry with you, like a suitcase. The word “benefit” means something helpful. A “habitat” is the natural place where something lives, so a monkey’s “habitat” is the jungle.

“Anguish” is another word for pain or distress. If you “feel anguished,” you feel unhappy and in pain. "Pain" is thus the correct answer. As for the other answer choices, “elation” means deep happiness and is an antonym of “anguish.”

A “hardship” is something difficult you experience, so "difficulty" is the best answer choice. The word “reward” describes something you get for doing the right thing or doing something well; “companionship” is another word for friendship; and “punishment” is something bad that you receive because of something you did wrong.

The word “triumph” means win or victory. It is the opposite of “defeat,” which means loss. An “argument” is when you talk to someone and the two of you think different things are right and debate them, often in an angry way. The word “contend” means to argue or to express what you think. So, you might “contend” an “argument” and then be “defeated” or emerge “triumphant.”