Please don't talk about this.they don't want it_____

Please don't talk about this.they don't want it_____
A.to get round B.to be got round C.get round D.being got round
答案上是A.我选的是D.want到底有哪些用法
______is something I can't understand.
A.How positive B.How does she stay positive C.she stay so positive D.How she stays so positive
答案上是D.我选的是A.为什么?
There are cases _____ speech has started late in a child who eventually turns out to be of high IQ
A.why B.which C.where D.as
答案上是C,我选了A,为什么不对?
Santa Claus ,a mythical figure in ____ has become an increasingly commercial holiday,has become an international symbol of hope.
A.what B.which C.who D.that
答案上是A,我选了B,为什么不对?
第二个选择题得A应该是How positive she stays 我漏打了