1.How could someone get a hold of your credit card number?
get a hold of：取得
2. I know. It's just such reckless spending.
reckless spending：花钱如流水
3.I think when someone steals your credit card, they've kind of already thrown caution to the wind.
throw caution to the wind：把理智抛至脑后;鲁莽行事;恣意妄为
4.Oh, Monica. You are not still going over that thing.
go over ：仔细检查;认真讨论;用心思考
5. Well, it does not ring a bell with me...
ring a bell with：听起来耳熟
