Sentence 1: Lily was looking forward to her birthday - she always had a big party. 
 Sentence 3: On her birthday, she still hadn't heard anything about a celebration 
 Sentence 4:  Lily was very disappointed when she walked into her dark living room 
 Sentence 5:  Her mood changed quickly when her friends jumped out to surprise her 
 Option 1: But her best friend wasn't mentioning any plans. 
 Option 2: She and her best friend planned a huge party together.