Jack and Alex want to buy some stationery（文具）. So one Saturday morning, they go to a stationery store.
　　Good morning, boys! Can I help you?
　　Yes. I want a , a , two and four .
　　OK. A , two , four and a . What color of the do you want?
　　Blue.
　　All right. Here you are!
　　How much are they?
　　A is one yuan. An is one yuan too. A is four yuan. And a is five yuan. It’s fifteen yuan in all（总共）.
　　What about you, boy?
　　I want a .
　　We have of red, yellow, green and blue. Which color do you want?
　　Which one do you think is better, the green one or the yellow one?
　　I think the green one is nicer.
　　OK. The green one, please. How much is it?
　　It’s ten yuan.
　　Oh, it’s a little expensive. And I want a , two and a box of . How much are they?
　　A is ten yuan. A is two yuan. A box of is fifteen yuan. So it’s thirty-nine yuan all together（总共）.