选择合适的选项补全对话。 以下为选项: A: They are very interesting. B: Where is the bookstore(书店)? C: Go straight and turn right. D: There is a map on the wall. 以下为对话内容: A and B are on the street(街道). A: I want to buy some books. 1.________ B: Look! 2._______ You can find the bookstore from it. A: Oh,it's not far. 3._______ B: Let's go. ... A: Wow,so many story books. 4._______ I want to buy some.