A. they are cruel and frighteningB. There is nothing I like less than dogsC. They're dirty and lazyA: How would you like a dog as a pet, Mary?B: A dog? My God!【D4】______ .A: Why? I think dogs are one of the best pets. It's a good guard. And it can entertain you.B: Oh, no! I've been afraid of dogs since I was a child. I think【D5】______ .A: You must be wrong, Mary. Dogs are the best friends of human beings. They are very obedient. B: Maybe. But I prefer to have a cat. A: The last thing I would like is a cat.【D6】______ . You can never expect a pet cat to catch a mouse, Betty. B: But they are gentle and pretty. And they can be good partners to their masters. A: Well, we can't persuade each other. Then you can have a cat as a pet. I'll have a dog. B: That's a good idea. It's unnecessary for both of us have dogs as our pets.