This sentence misuses the word "to." The correct word, meaning in addition to, is "too." "To" with one "o" means towards/for and "two" is a numerical value. Note that the correct verb is "wanted" since the verb used prior to this one in the sentence was "saw," which is in the perfect past tense. "Wanted" is appropriate in order to maintain consistency in tense. The correct choice is, "she wanted presents too."

This sentence misuses the word "lead." The word "lead" is present tense, but the context of this sentence indicates that the action has already happened from our perspective and should be in the past tense. The past tense of this word is "led." Furthermore, "his or her" is imprecise; "their" is more appropriate for the sentence because the word "kids" is plural. The correct choice is, "led the kids to their classes."

This sentence misuses the word "past." The word "past" refers to a timeframe of events that have already happened. The correct word is "passed," which refers to the action of having happened. The correct choice is, "After the deadline passed." The other choices are incorrect because they would be inconsistent with the tense of the latter half of the sentence. 

This sentence misuses the word "sit." The word "sit" means to rest, remain, or place one's self. The appropriate word here is "set," which means to put/place something. No additional changes are necessary. The phrase "Before she went running" is an example of an introductory statement, explaining information necessary to the context of the sentence, but outside of the main sentence, grammatically. These types of phrases must be followed by a comma in order to separate them from the rest of the sentence. The rest of the sentence is one independent clause. The correct choice is, "Before she went running, Jennifer made sure to set the bills on the counter so that she would not forget to attend to them when she returned."

This sentence misuses the word "capitol," which refers to a building where lawmakers meet. It is clear from the context of the sentence that Kiera is traveling to a city, not a specific building. The correct word is "capital." No additional punctuation or changes are necessary. The correct choice is, "Kiera would be traveling to the capital of the country for her new job."

This sentence misuses the word "emigrate," which means to move from. The word that means to migrate to another place is "immigrate." One key to not confusing these words is that "emigrate" is always used with the word from, while "immigrate" is always used with the word to. No additional changes are necessary, so the best choice is, "Emmy's family immigrated to the United States from Ireland."

This sentence misuses the word "principal." The word "principal" is a title referring to the head of a school or organization or meaning a sum of money. The correct word here is "principle," which means a fundamental rule. No additional punctuation/changes are necessary. The difference between "would" and "will" is arbitrary in this sentence and does not change the meaning. The correct choice is, "students would learn the principles of marketing."

This sentence misuses the word "you're," which is a contraction meaning you are. The appropriate word here is "your" - the possessive form of "you." Everything else in the sentence is already correct. The other sentences either still misuse the word or misuse the punctuation in the sentence. The correct choice is, " "Even though it will not be collected, it is still important to do your homework." "

This sentence misuses the word "allusion." An "allusion" is an indirect reference to something and is often used to make references to literary works. It is clear from the context of the sentence that what is meant here is "illusion," a hallucination. The correct choice is, "Oscar suspected that he was beginning to see illusions."

This sentence misuses the word "it's." It's is a contraction for "it is," but it is clear from the context of the sentence that what is needed here is the possessive form of the word: its. The possessive form of "it" does not include an apostrophe before the s. Furthermore, the form " its' " is not an actual form of "it" - it is not a word - and no comma is necessary in this sentence. The best choice is, "with the introduction of its iPhone."