make your purchases vs. make your buying

[LuciferS]

English Language Tests, Intermediate level

ESL/EFL Test #45 "Speaking: At the Supermarket", question 9

There are now only ten minutes remaining for you to make your ......... and go to the checkout.

(a) purchases
(b) buying
(c) sales
(d) selling

English Language Tests, Intermediate level

ESL/EFL Test #45 "Speaking: At the Supermarket", answer 9

There are now only ten minutes remaining for you to make your purchases and go to the checkout.

Correct answer: (a) purchases

Your answer was: incorrect
There are now only ten minutes remaining for you to make your buying and go to the checkout.
_________________________

why isn't the answer is buying ?

Lucifer

[Conchita]

The verb normally used with 'buying' is 'do', not 'make'. You can either do your buying or make your purchases.

The use of 'make' and 'do' is another thing you have to be philosophical about in English grammar, I'm afraid.