求一道英语补全对话的答案.

题目

求一道英语补全对话的答案.
补全对话
A:Can I ___71______ you
B:Yes,please .I ___72____ a T-shirt ___73____ my son .
A:What __74_____ do you like We have T-shirts ___75___ all colors .
B:Blue .
A:Here you ___76_____ .
B:__77_____ ____78____ is it
A:Ten dollars .
B:Ok,I’ll ___79____ it .Thank you .
A:You are ____80_____ .
请问73和75题怎么填?

答案

help,need,for,color,of,are,how,much,take,welcome