求教这几个英语语法问题，谢谢！

下面答案供参考
There is just one point that l want to make clear.
There is just a point, where I want to make things clear.
There is just a point，which I want to make clear.
There is just one point，from which I want to make it clear.
There is just one point，of which half I want to make clear.

There is just one point __which/that_____ l want to make clear.
There is just a point, ___where____ l want to make things clear.
There is just a point，___which____ I want to make clear.
There is just one point，___where____ I want to make it clear.
There is just one point，_____whose__half I want to make clear.

that,witch,where, from witch, of witch