"Frugal" means "thrifty" or economical. The other answer choices here do not relate to money or other expenses.

Whenever someone is "gullible," he or she will believe just about anything whatsoever. You can easily "use" or exploit a person who is like this. That is, a gullible person can be tricked for you to gain an advantage over him or her (if you wanted to, at least).  A more standard synonym for "gullible" is "naive," though this is not an option among those provided.

“Exquisite” means ornate, dainty, and beautiful, so "lovely" is the correct answer. As for the other answer choices, “candid” means blunt and honest; “magnetic” means attractive; “foreboding” means suggesting something bad will happen soon in the future; and "expensive" means financially costly.

“Imminent” means occurring soon, making "looming" the best answer choice. As for the other answer choices, "lavish" means luxurious; "incipient" means just having begun or developing; "fortunate" means lucky; and "gracious" means thankful and polite.

"Toxic" is an adjective that means "causing or capable of causing death or illness if taken into the body" when used of a plant or substance, "producing poison as a means of attacking enemies or prey" when describing an animal or insect, or "extremely unpleasant or malicious." While "fulsome" might look like a good answer choice, "fulsome" actually means "complimentary or flattering to an excessive degree" or "of large size or quantity; generous or abundant," so it cannot be the correct answer. "Poisonous" however, is a synonym of "toxic," so "poisonous" is the correct answer.

"Turbulent" means characterised by agitation or chaos. "Tempestuous" means stormy, so it is a synonym of "turbulent." "Calm," "tranquil" and "peaceful" are all antonyms of turbulent that mean untroubled.

"Wanton" can mean random, so "random" is the correct answer. To help you, "implausible" means almost impossible or hard to believe, "credible" means reliable, "demeaning" means humiliating or undignified, and "suspicious" means doubtful.

The word "virulent" means harmful. "Harmful" is the best choice, as it is a part of the definition of "virulent."

The word "auspicious" means promising success. The best choice is "promising," as it shares the same definition as "auspicious." Considering the other choices, "austere" means strict, "oust" means overthrow or remove from a position, and "howl" means cry out.

"Prone" means to be inclined towards doing something. For example, if you are "prone" to lying, then you lie often. To further help you, "cautious" means careful and wary; "objective" means subject to logic instead of personal opinion; "subjective" is an antonym of "objective" and means subject to personal opinion instead of logic.