I want to buy -----8-dollar stamp. A.a B.an C.the D/

I want to buy some I want to buy something ( ) her i want to buy some medicine_______my toothache I want to buy a house _______money. I want to buy( )art book. I want to buy skirt ______my father i want to buy roller skate I want to buy this phone. I want to buy a present______mu cousin I want to buy a hair c____ I want to buy an u-------. I want to buy an access是什么意思 I+want+to+buy+a+postcard. I want to buy a _______of shorts. I want to buy a p____of shose want,ruler,buy,I,a,to I want to buy a pair of_shoes I want to buy a paiI want to buy a pair of_shoesI want to buy a pair of_shoes i want to buy ones和i want to buy one的区别是什么?