I have great ____in learning math and I am so worriedtrouble' interest\joy\fun

I have great ____in learning math and I am so worriedtrouble' interest\joy\fun
I have great ____in learning math and I am so worried
trouble' interest\joy\fun

I have great ____in learning math and I am so worriedtrouble' interest\joy\fun
trouble

I have great _trouble___in learning math and I am so worried

选trouble,
固定句型 have trouble in doing sth表示做某事有困难
整个句子是 我学习数学有困难所以很担心。

选trouble