Sentence 1: A professor gave a test so hard that even he would fail it. 
 Sentence 3: The professor used this test to fail everyone in the class 
 Sentence 4:  The next day there was only one student left in the class 
 Sentence 5:  The professor commended the student on being the best cheater 
 Option 1: Every student failed the test. 
 Option 2: The students created very elaborate ways to cheat to pass this.