A(AN)...IS A MACHINE WHICH IS USED FOR KEEPING FOOD FRESH.A(AN)....

21- - DE KIEM TRA THAM KHAO 21- - DE KIEM TRA THAM KHAO
DE KIEM TRA THAM KHAO

21-A(An)...is a machine which is used for keeping food fresh.

a-electric cooker

b-vacuum cleaner

c-fridge

d-computer