Is this factory__ your father once worked in before he retir

Is this factory__ your father once worked in before he retir —Is this factory_____ your father once worked? Is that factory which your father once worked in? Was it in this school __ your father once worked __ you are This is the farm ____Tom's father once worked when he was yo Is this the factory__ his father visited last Is this school _____ your father worked in ten years ago?（选择 请问Is this school ______ your father worked in ten years ago? Is it in this factory__"Audi" cars are produced?( ) Is this factory____your mother once worked. is this farm where your parents once worked?是什么定语从句还是表语从句 He once worked in a hotel for two years.So he is a _____ man