Sentence 1: Kevin fell asleep one night but woke to a nightmare. 
 Sentence 3: Suddenly a fireman pushed into the room and picked him up 
 Sentence 4:  He carried Kevin out of the house and dumped him on the lawn 
 Sentence 5:  The fireman had saved Kevin's life and extinguished the fire 
 Given Sentence 2: They saw black smoke billowing out of the tunnel.