They forget to switch off the lights and even leave televisions and air conditioning units (29) ___________ when they leave the room.Đoạn văn29/45Read the following passage and choose the word or phrase (A, B, C or D) which best fits each of the numbered blanks. They forget to switch off the lights and even leave televisions and air conditioning units (29) ___________ when they leave the room. onoffforinGiải thíchA. on