_________is watching TV. Turn it off, will you?

 Many people in the west make ________ a rule to buy Christmas presents for their relatives and friends. 

——Do you know the answers to these questions asked by your little brother?——Of course not, but I can’t let him know       .

—Which type of car do you like better?—       ．They are both expensive and high emission（高排量）．

--- Who knocked the door? --- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ______ was.