I want to buy a sandwich (写问句)

I want to buy a sandwich (写问句) I want( )to buy/buy a car. 问句选答句比如A.What do yuo want to do 1.I want to buy a robotB.Whe I want to eat a hamburger ________ a sandwich. I want to buy some books this afternoon的问句 I want to buy some books的问句 I want to buy a touch! I want to buy a book ( ) flowers I want to buy a present______mu cousin I want to buy a hair c____ I want to buy a pair of_shoes I want to buy a pai I want to buy a gift I want buy a gift 哪个对?为什么