根据中文提示完成对话。

Boy: What are you going to do this weekend?

Girl: I'm going to 1_____________ (购物) on Saturday morning. I want to buy a pair of

       2_____________ (鞋子).

Boy: And then?

Girl: I'm going to the 3_____________ (科学书店). And in the evening I'm going to 4_____________

       (看望祖父母).

Boy: What are you going to do on 5_____________ (星期天)?

Girl: I'm going to the zoo. Would you like to go with me?

Boy: Sure.

企业所得税实行（）、（）、（）的征收办法。