Sentence 1: Jenny's birthday is coming up. 
 Sentence 3: Her parent decided that one would make a perfect present 
 Sentence 4:  On the morning of her birthday she heard a noise downstairs 
 Sentence 5:  It was her puppy 
 Option 1: There is one thing she always wanted, a kitten. 
 Option 2: There is one thing she has always wanted, a puppy.