Sentence 1: The office potluck was on Friday. 
 Sentence 3: She stayed up late on Thursday night to bake the cheesecake 
 Sentence 4:  Heather brought the cheesecake to work on Friday morning 
 Sentence 5:  Everyone enjoyed eating the dessert Heather had made 
 Given Sentence 2: He opened it and found a tiny kitten.