-- Do you think it's a good idea to make friends with your students?-- I do. I think it'

问题补充：

-- Do you think its a good idea to make friends with your students?

-- , I do. I think its a great idea.

A. Really

B. Obviously

C. Actually

D. Generally

答案：

A. Really

B. Obviously

(答案→)C. Actually

D. Generally

解析：此处Really真的； Obviously显而易见地； Actually事实上； Generally一般情况下。句意：——你认为和学生交朋友是个好主意吗？——实际上，我同意。我认为那是个好主意。根据句意选C。