Sentence 1: Mary adopted a dog from an animal shelter. 
 Sentence 3: Mary procrastinated because she was afraid about the spay surgery 
 Sentence 4:  The vet told Mary the operations are very common and not to worry 
 Sentence 5:  The dog had the surgery and is doing very well 
 Option 1: The shelter requires the adopted dogs to be spayed or neutered. 
 Option 2: The shelter requires the adopted dogs to be spayed or neutered but the dog will never get a surgery.