---Do you like pets?

---Yes. I prefer to ________ fish because they are clean and they can’t spread （传播）disease.

根据对话内容,在空白处填写适当的话语。
   Dora: Do Chinese keep animals for pets?
Li Dan: Not as __1__ as people in the USA.
  Dora: What animals do they usually keep?
Li Dan: They usually keep dogs, cats, birds, fish and so on.
  Dora: __2__ do you keep?
Li Dan: I don't keep any animals as a pet.
  Dora: __3__?
Li Dan: To keep a pet takes time and costs money.
  Dora: Yes, that's true. If you keep a pet, you need to spend some time __4__ it, like
            walking it, feeding it and cleaning it. When it gets sick,  you need to send it to hospital.
Li Dan: I don't keep pets because I think pets often make our rooms dirty and smelly.  If I keep a
            pet,  I prefer to keep fish because they are clean.
 Dora: __5__.