Explanation

　　1.The correct answer is A

　　The error in this sentence occurs at (A), where there is an improper verb form. The use of “requires that” dictates that the subjunctive form of “to wear” is needed. The phrase “have been wearing” should simply be “wear.”

　　2.The correct answer is E

　　There is no error in this sentence. The plural present tense verb “indicate” agrees with the plural subject “the results.” The phrase “both safer and” appropriately introduces the compound subject complement “both safer and more effective.” And the verb phrase “was…assumed” appropriately indicates an action that occurred in the past: i.e. what scientists thought before the new studies.

　　3.The correct answer is B

　　The error in this sentence occurs at (B), where there is improper pronoun use. The reflexive pronoun “myself” is used incorrectly. The first-person singular pronoun “I” is needed instead so that the sentence communicates clearly that two people “got to the box office.” (“Mitzie...got to the box office” and “I got to the box office”)