Sentence 1: Sam has been working at his job for 4 years now. 
 Sentence 3: His boss noticed and decided to honor his hard work 
 Sentence 4:  He gave him a promotion 
 Sentence 5:  Sam is happy to see that his hard work is paying off 
 Option 1: He really didn't like his job much so he decided to get another one and is much happier. 
 Option 2: He is a hard worker and really passionate about his job.