Sentence 1: David awoke to the acrid smell of smoke. 
 Sentence 3: He dropped to the floor and touched the door, finding it cool 
 Sentence 4:  He heard sirens as he crawled down the hall to his sister's room 
 Sentence 5:  Together, they escaped the fire and found their relieved parents 
 Option 1: The air in his room was hazy and it was hard to breathe. 
 Option 2: The air in his room was hazy and it was hard to breathe and it made him pass out.