根据对话内容，从方框内五个选项中，选出能填入空白处的最佳选项
| A: Do you have any interesting books for children? B. Have a look. C. OK.I will take them D:How much are they? E: What can I do for you? |
A:Good morning.____1___.
B:I’m looking for a present for my friend, Dave.
A:Oh just a moment. There are some toys over there . __2_ _. Do you like them?
B:Yes. I think they are really beautiful. But I want to buy some books. _3_.
A:Please come here. There are some picture books and story books. They are very interesting.
B:___4__
A:They’re 20 yuan.
B:____5____.