A：Welcome to Xingxing Clothes Store，Can I （51）　　you？

B：I'd like to buy a sweater （52）　　my mum．Her birthday is coming．

A：A happy mum!What size do you want for your mum？

B：Small is OK．

A：All right．What （53）　　does your mum like？

B：She likes white．It looks good on her．

A：What about this one？

B：It looks beautiful．How （54）　　does it cost？

A：Oh，it's 168 yuan．

B：Well，that's great!I'll （55）　　it．I'm sure she will like it．