This question tested your ability to spot an often easy to overlook error, a missing "i" verb. The reason this is easy to miss is purely visual, in the middle of a visually complex word like "deficient" it is almost natural to overlook a missing letter. It is important, when proofreading or having your spelling tested, to give words an extra look, to make sure that your eye hasn't naturally filled in a missing letter.

The rest of these adjectives are all spelled correctly.

The correct spelling for the word "zealously" has an "a" after the "e." You could have known this by simply knowing the correct spelling, or realizing that this adverb would be based on the word "zeal," which includes an "a" after the "e." The rest of the options were correctly spelled adverbs.

The only word that is misspelled is "comotion," which is missing an "m." "Commotion" is the correct spelling. All the other given options are spelled correctly.

"Calamity," when spelled correctly, uses only one "t" preceding the "y." All the other options are correctly spelled.

The given options are all words used to describe different kinds of people (making them all, obviously, nouns). "Disciple," however, needs to have an "s" preceding the "c."

The given words are all verbs describing emotional changes or states. All of them are spelled correctly.

The given options are all verbs pertaining to the act of changing something's physical state. They are all spelled correctly, so the only correct answer is "no mistakes."

The example sentence erroneously uses an adjective where an adverb is needed. "Bitter," in this context, modifies the verb "was," and therefore should be replaced by the adverb "bitterly." If the cold were being used as a noun, then the adjective form of "bitter" would be appropriate—for example, "We were wrapped in a bitter cold."

The correct choice features a very common error of pronoun case, which leads the sentence to incorrectly conclude with a preposition. Rather than using the subjective-case "who" in saying "who I am speaking to," it is correct to use the objective-case "whom." Sentences should never, in academic writing, end with a preposition.

The correct answer features inconsistent pronoun usage. Since the sentence first uses the pronoun "one," the sentence must remain consistent in its usage of that pronoun. It is incorrect to follow "one" (when used as a pronoun) with "you." The correct version of the sentence reads, "It is very important to look both ways when one crosses the street because one never knows when a car might come." This question interrogates the principle of consistent pronoun usage. None of the other options included any grammatical errors.