the apple which is on the table桌子上的那个苹果
the CD which I bought today我今天买的那盘CD
the chair on which you are sitting你正坐着的那把椅子
the box in which the keys are kept装钥匙的那个盒子
the charity to which he donated money他捐款的那个慈善团体
He knew, which is incredible.他竟然知道, 真令人难以置信。