Hi. I think you'd better say "I have been engaged in...". That's all

I agree with M.H. about 'been engaged in', but - unlike Bill - I don't have a problem with 'communicative language teaching'. It is one of several approaches to language teaching, and contrasts with more traditional approaches such as grammar/translation-based teaching. You need to delete the definite articles, though: During the past several years, I have been engaged in communicative language teaching and placement test and OPI test management in summer intensive language programs.

During the past several years, I have engaged in the communicative language teaching and placement test and OPI test management in the summer intensive language programs. Well, yes, but, the concept of "the communicative language teaching and placement test and OPI test management" is just a bit weird. For instance what would be the purpose of "language" without "communicative". That phrase is what we call a "tautology" so it would not be used. so you might do better with "the language teaching and placement test" I hope that helps. I suggest you look up "tautology" in you dictionary and come up with some others to see if it makes any sense. You can observe a lot by watching If we do not succeed, we run the risk of failure