用that which who whom填空

。Please pass me the book___which_ lies on the desk（请把桌子上放的那本书递给我） which用于主语系物件时eg。book deskThe girl__who__you saw at the meeting is a famous swimmer。（你在会上看待的那姑娘是个有名的游泳选手） who用于主语系人The first thing_that__you must do it to have supper。（你该做的第一件事就是吃晚饭）that基本上都得,但句中出现first时只能用that 还有些都是这样but i am sorry,i forgot it April 1st is the day _which__is called April Fool's Day in the west。（四月一号在西方被称作愚人节 ）which同上。A nurse is a person __who looks after people __that__are ill。（护士就是照顾患者的人）whom是宾格,就是说它只能做宾语,得放在动词或者介词的后面