求教这几个英语语法问题，谢谢！

Question

There is just one point _______ l want to make clear.
There is just a point, _______ l want to make things clear.
There is just a point，_______ I want to make clear.
There is just one point，_______ I want to make it clear.
There is just one point，_______half I want to make clear.

Answer 1

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.追问

3和4不对，3是one, 4是and, 刚刚知道，但是我不理解3。

追答

There is just one point that l want to make clear. 限制性定语从句
There is just a point, where I want to make things clear. 非限制性定语从句
There is just a point，which I want to make clear.非限制性定语从句，如果用one则是同位语后面是省略that的定语从句。两句意思一样。
There is just one point，from which I want to make it clear.本句中的fromwhich是非限制性定语从句中的状语。which和it 不是同一件事。如果用and 则是并列的简单句。
两句意思不一样。
There is just one point，of which half I want to make clear.本句中of which是定从中的定语
所填答案 并不是唯一的，所以是供参考

Answer 2

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.本回答被网友采纳

Answer 3

that,witch,where, from witch, of witch