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____.
在扔掉废物前进行分类是必要的．
It's necessary to divide the waste into different kinds before we it ．
成功的关键在于从错误中学习，并且永不放弃．
The key to success is to learn from your mistakes and never ．
我们历史老师中等身高．他对我们很严格．
Our history teacher is of medium ．He is very with us．
坚持你的梦想，将来有一天，它可能会实现．
on to your dream；one day it may come ．
应当允许青少年做出自己的决定．
Teenagers should be allowed to their own ．