Sentence 1: Gina was desperate to get her loose tooth out. 
 Sentence 3: Her brother tied a piece of string to it 
 Sentence 4:  The other end was tied to a doorknob 
 Sentence 5:  When he slammed the door the tooth came out 
 Option 1: She just couldn't pull on it hard enough. 
 Option 2: She finally pulled on it hard enough.