Sentence 1: After a semester of hard work, I finally got an A in my math class. 
 Sentence 3: I did every homework assignment, even the difficult ones 
 Sentence 4:  Although I wanted to quit, I persevered through the class 
 Sentence 5:  I'm proud of my grade 
 Option 1: I had attended every lecture because I really enjoyed the class. 
 Option 2: I had attended every lecture, no matter how boring it was.