Sentence 1: On Saturday morning I had to get to work very early. 
 Sentence 3: I realized the alarm clock was blinking due to a power failure 
 Sentence 4:  I was buttoning my shirt as I ran out the door 
 Sentence 5:  The bus pulled up to my stop just as I arrived 
 Given Sentence 2: I woke up because it seemed too light outside.