Sandy 准备给他妈妈买生日礼物,请写一篇购物时的对话,要用到expensive,cheap,sweater,want

-O:HEY!GIRL!MAY I HELP YOU?
-S:OH!I WANT TO BUY A SWEATER.
_O:LOOK AT THIS ONE.IT'S VERY NICE.
_S:HOW MUCH?
-O:800 YUAN.
-S:YEAH.BUT I CAN'T PAY IT.IT COSTS ME A LOT OF MONEY!IT'S TOO EXPENSIVE!YOU KNOW,I JUST A STUDENT.
_O:SORRY.AND HOW ABOUT THIS ONE?IT'S 380 YUAN.
-S:GREAT!THANKS!
-O:THAT'S ALL RIGHT!
亲.这是小学生作文吗?