The definition of "detain" is to confine or to keep from proceeding. The other answer choices do not match this definition; "release" is an antonym of "detain," "detangle" means to remove tangles, "avoid" means to keep away from, and to "identify" is to recognize or associate. 

The word "rue" means feel sorrow. "Regret," which means feel sorrow over a loss or a poor decision, is the best choice. Considering the other choices, "smell" means detect the scent of, "gather" means collect, and "study" means gather information about.

"Relish," when used as a verb, means appreciate greatly, so the answer choice closest in meaning to "relish" is "enjoy," which is a verb meaning take pleasure in. Considering the other answer choices, "dislike" is a verb meaning not enjoy or not like, "burden," when used as a verb, means give someone a thing or a task that causes them undue stress and worry, and "hide" is a verb meaning go to a location in order not to be seen or noticed.

"Rue" is a difficult word to figure out if you aren't familiar with it, as it's too short to be able to lend much help with roots. You may have heard the expression "rue the day," which people who speak a very formal English use when making threats. To "rue" means to lament or regret something. Don't confuse with the unrelated word "roué," which means a sexually immoral man.

When used as a transitive verb, to "gall" means to annoy or to make someone angry. It can also be used as a noun, in which case it means boldness or audacity. So, "annoy" is the correct answer. To help you, "debilitating" means greatly weakening, "choleric" means bad-tempered, and to "placate" means to calm or to soothe.

To "fret" means to worry, so "worry" is the correct answer. To help you, "permit" and "prohibit" are antonyms of one another; that means that they have opposite meanings. Also, to "permit" means to allow, and to "prohibit" means to ban.

"Rue" means to feel regret for or to feel sorrow about a past action. To further help you, "desire" means want; "admire" means appreciate; "abhor" means hate or detest; "suspend" means pause.

"Adore" is a verb meaning like very much, so the answer choice closest in meaning is "love," a verb meaning feel deep affection for when referring to a person or to people, or more informally and when not being used to refer to people, like a great deal. Considering the other answer choices, none are close in meaning to "adore": "complain" is a verb meaning express dissatisfaction about something; "annoy" is a verb meaning pester or bother; and "explain" is a verb meaning clarify in detail.

To "petrify" someone or something means to severely frighten, scare or terrify him, her, or it, so "terrify" is the correct answer.

"Pacify" means make peaceful or quiet, so "calm" is the best match.