根据对话内容，在每小题的空白处填入适当的话语，使对话意思完整。

A：What can I do for you?

B：I want to buy a pair of shoes.

A：_________________________________________(1)?

B：Size eight or nine.

A：OK! How about this pair?

B：Sorry, I don’t like black. ____________________________________(2)?

A：Oh, yes. We’ve got blue, white and brown ones.

B：Can I have a look at the brown ones?

A：Yes, please.

B：_______________________________________(3)?

A：Forty-six yuan.

B：It’s too expensive. ______________________________________(4)?

A：How about forty?

B：No, it’s still expensive. What about thirty-five？

A：Er… all right. _________________________________(5).

发动机停转，可能的原因有哪些（）

A.机油不足或劣化

B.机油太满溢出

C.燃油不足

D.电缆接线错误