Sentence 1: Billy had an hour to finish his test. 
 Sentence 3: When he finally got started he realized there was an essay to write 
 Sentence 4:  He wrote and wrote as fast as he could 
 Sentence 5:  He turned in his test with 30 seconds to spare 
 Option 1: He fell asleep and did not wake up until the test was over. 
 Option 2: He sat and daydreamed for the first 45 minutes.