Sentence 1: In Korea, McDonald's will only give you one packet of ketchup. 
 Sentence 3: I think this is because they knew Americans liked ketchup 
 Sentence 4:  One day, a really cute cashier gave me three packets of ketchup 
 Sentence 5:  Looking back, I don't know if she was cute or if it was the 3 packets 
 Given Sentence 2: She told her teacher.