Sentence 1: Mike woke up with a really bad stomach ache one Sunday morning. 
 Sentence 3: When he got there he fainted and did not wake up until several hours 
 Sentence 4:  When he awoke the doctor told him that he was lucky, he had a tumor 
 Sentence 5:  The operation was successful and Mike was able to live until very old 
 Given Sentence 2: After a lot of research he decided to buy an electric lawn mower.