She ...going to the post office some stamps.
D
1 ЖАУАПТЫ ТАҢДАҢЫЗ
is/ to buy
's/ for to buy
is / for buying
../ buy​

She is going to..... To buy some

Is/to buy

.....

Намерение или цель.

Поэтому конструкция такая. to buy

Correct Answer :Is/to buy - She is going to the post office to buy some stamps.