there is a secret can't

I can't tell you the r____ why I did that.It is a secret. 这句It is a secret that I can't tell you.语法正确吗? Our love is a secret ,untenable .If i love you can't explain 这个是填介词的It is a secret.It is only ______ you and me.You can't This is a secret! is a secret . This is a secret Where there is a will(意志), there is a way. The secret of s 1 there is a pain inside.that you can't touch.that you can't g there is a pain inside,that you can't touch,that you can't g can you keep a secret Can you keep a secret?