68.Acoording to the passage, the thermostat is used to . (A)make rooms quieter (B)control room tempersture (C)turn off the air conditioner (D)reduce room air pollution

66．Which of the following is TRUE about using your NatWest Credit Card? (A)You have to pay back with interest within 56 days. (B)You will be charged some interest beyond two months. (C)You can use the card in any shop across the world (D)You will gain one air mile if you spend ￡20 on traveller’s cheques.