补全对话。根据对话内容，在每个标有题号的空白处填入一个适当的句子，使对话完整。
A: What can I do for you ?
B：I want to buy a pair of shoes.
A: 
B: Size eight or nine .
A: Ok ! How about this pair ?
B: Sorry , I do not like black. 
A: Yes.We have blue ,white and brown ones .
B: Can I have a look at the brown ones ？
A: Yes ,please.                 
B: 
A:Forty—six yuan.        
B: It is too expensive  
A: How about forty ?    
B: It is still expensive . What about thirty-five ?
A: All right.
B:OK.