This sentence misuses the word "who." Specifically, it is in the wrong case. If the clause "who many wanted to speak at their events" were to be rephrased, it would be "Many wanted her to speak at their events." The word that "who" is substituting for is the object of this clause; therefore, the correct form is "whom." The correct choice is, "The speaker, whom many wanted to speak at their events."

This sentence uses the wrong case of the word "who." If we were to reword the relative clause,  "who many students admire" would become "many students admire him." Since the "him" is the direct object of the word "admire," the correct choice is "whom ("who" is used when it is the subject of the clause, "whom" when it is a direct object)." Note also that the word "that" does not begin a new clause, so that choice would be incorrect since the commas would have to be omitted; also, "which" is never used for humans, always "who." The correct choice is, "The professor, whom many students admire, is."

This sentence misuses the pronoun "whom." "Whom" is used when the word it refers to is acting as the direct object of something in the clause it appears. Rewording the relative clause would change "whom was driving" to "he was driving." Since "he" is the subject of the clause, the correct word here is "who." Note that "that" does not begin a relative clause, so using this word would mean the commas would need to be omitted for the sentence to be correct. The correct choice is, "who was driving, flipped the car."

This sentence misuses the word "whom." "Whom" is only used when the pronoun's placement in the relative clause acts as the object of something. If we reworded this, "he helped her with her project" would be the best choice. Since "he" is the subject, the correct choice is "who." Note that "that" would not take a comma before (or after) the word, and "which" can never be used with humans. The correct choice is, "who helped her with her project."

This sentence misuses the word "that." The word "that" is never separated from the preceding clause with a comma. Both commas would have to be omitted in order for this choice to be correct. Since the antecedent of this pronoun is the word "game," which is an object, the appropriate choice is "which."

This sentence misuses the pronoun "whom." "Whom" is used when it acts as the object of another word in a clause. In this sentence, however, "whom" is in the place of the subject. If you replaced "whom" with another pronoun, you would use "he" (he wrote the most popular novel...). The correct choice is "who."

This sentence misuses the word "him." "Him" is the form used when the pronoun is the object of another word, but it is acting as the subject. The correct choice is "he" (the use of "his" later in the subject indicates the subject is male).

This sentence contains an error in pronoun case. The word  "whom" is only used when it functions as the object in a clause. As used, however, it functions as the subject of that clause; rewording the sentence would change "whom had written only one other novel" to "he had written only one other novel." The appropriate choice is "who." Note that "which" is inappropriate, since the word "author" presumably refers to humans. The correct choice is, "his book, the author, who had written."

The use of the present tense verb "makes" in the final, underlined portion of the sentence creates a confusing meaning. The present participle is the only verb from which appropriately connects to the main portion of the sentence. The only answer choice which correctly makes this change is "making the entire conversation unnecessary in the long run."

The use of the present participle "having" in this sentence is incorrect, as the issue is whether the defendant had possesion in the past. The verb needs to be changed to the past participle form. The only answer choice which contains the correct verb form is "ever had possession of the murder weapon."