What I am really interested are the subject of____.

What I am really interested are the subjects of_______.

A、

language

practical maths 

I am not really interested in math, but I can _________.

A、

muddle through  

look through       

 muddled through     

 looked through

I am interested in what to do next.

A、宾语
B、定语
C、主语
D、表语

When I start writing my graduation thesis, I should choose a subject area I am interested in.