Sentence 1: Billy had a math test at school. 
 Sentence 3: The time came and he did his best 
 Sentence 4:  The next day he found out he got a B 
 Sentence 5:  Billy was relieved and promised himself never to do that again 
 Option 1: He was too nervous and threw up and was sent home. 
 Option 2: He was stressed because he hadn't studied.