Mary: I'm now in the sea. I can't believe it! It's so beautiful! What a colorful fish! It's so lovely! Little fish, don't go away! Oh, here comes a blue whale. Wow, it's so big! It's bigger than my classroom. Oh no! There is a shark! Help! Help!

　　 Helen: What's the matter, Mary?

　　 Mary: I saw a shark. Its teeth are so big!

　　 Helen: Oh, it must be a dream.

　　 Mary: ...Yes, it's a dream.