past continuous vs. past perfect

3. The radio was on but nobody ____ (listen) to it.
4. Irene didn't come to school yesterday. She____(already/pass) the test.
5. The car was very dirty. Nobody___(clean) it for weeks.
6. Carol was at the party last night. She____ (wear) a very nice dress.
7. I__ (do) anything this time yesterday.
8. When I last saw you, you___ (study) at university.
9. Somebody sang a song which I___(hear) before.
10. Last year we were in the USA for the first time. We___
(be/never) there before.