S: That'll be $70, please. Will you be paying by cash or charge?
C: Charge. Here's my card.
S: Okay, sir, here you are. Thank you very much.
1．pick out… 挑选……
例：Tracy went to the department store to pick out some gifts for her friends.
2．bring sth back 带回某物= bring back something
例：Mr. Wilson made a business trip to. Europe and brought back some souvenirs for his children.
3. receipt n．收据
5．alteration n. 修改；改变
alter vt. 修改（衣服，房屋等）；改变（形状，外貌等）
make an alteration to sth 修改／变更某物
例：Because of his spy's report, the general made several alterations to his battle plan.
Your skirt should be altered; it's too long.