2. I______( had used ，use ，used ) my computer last night.
3. My grandfather_____(stop，stopped，had stopped ) working twenty years before he died.
4. I_____( had broken，broke，break ) my arm in the summer and couldn't write, so I couldn't take my exams until Christmas.
5. All the teachers_______( were， had been， was ) very nice at my kindergarten.
更新1:
6.It_____ ( was，were，had been ) so hot last summer. 7.The children______ ( was， were，had been ) tired because of the long journey. 8. John______ ( were，was，had felt ) sick for two weeks before he finally went to the doctor last Friday.
