6．A：Hello!What can I do（71）for you？ B：Hello!I'd like a pair of shoes． A：What（72）size do you want？ B：Size 8．I like this pair．Could I（73）try them on，please？ A：Yes，of course． B：Well，they （74）fit me very well．How much are they？ A：They are twenty dollars． B：OK，I'll （75）take them．
