很高兴为你解答.
保证正确率~!
正确答案是：
A:What can I do 【 for 】you ,madam
B.I’d like some T-shirts【 for】my son .
A:How 【 about 】this blue one
B.I think it’s too long .
A:【Which】【size】 would you like
B.Size M
A :What do you【think】【of 】this one
B.It’s good .What’s it 【made】【 of
A:100% cotton .
B.Good .【How 】【much】 is it
A:¥ 108 ,please .
B.OK ,I’ll 【take / buy】it
祝开心~!