补全对话,每空一词,缩写词算一词

补全对话,每空一词,缩写词算一词
A:Can I helo you,madam?
B:Yes,I want to buy a ____(1)of shoes ____(2)my son.
A:____(3)____(4) does he wear?
B:Size 7.
A:____(5) ____(6) does he like?
B:Black.
A:OK.____(7)____(8)this pair?I'm____(9) he will like them.
B:Er,they look nice.____(10)____(11)are they?
A:They are five dollars.
B:OK,I'll take them.Here is your____(12).
A:Thank you.

pair for
what size
what colour
how about sure
how much
change