I want to say that current standards in education are not tha same as they were in some time in the past. I wonder if I should use the passive or active voice here.
- A lot of standards in education have changed since I was a student.
- A lot of standards in education have been changed since I was a student.
Which one is preferable? I think that second option with passive voice is correct, because education standards can't change themselves. However, I wonder if there're any cases in which we could use the first one.