完成下面的段落，让其组成一个流畅、连贯的故事。


Mary was walking in the park when she saw a _________. She was _______ and decided to ________. Suddenly, she heard a loud _________ coming from behind her. She turned around and saw a _______ running towards her!
Mary was walking in the park when she saw a cute little bunny. She was delighted and decided to get closer for a better look. Suddenly, she heard a loud growling noise coming from behind her. She turned around and saw a big fierce dog running towards her!