Choose the best answer: He .... a teacher before 1945. I .... to bede after I had finished my homework

B.CHOOSE THE BEST ANSWERS:
1. He _______ a teacher before 1945
A.is             B.was              C.had been
2. I ______ to bede after I had finished my homework
A.went          B.had gone               C.go
3. My sister ____ at TRAN HUNG DAO school 3 years ago.
A.had studied         B.studied             C.studies
4. ____ they ____ off the lights before leaving class?
A. Had turned              B. Did ... turn                 C. Do... turn
5. What ____ you ____ yesterday ?
A. had ... done                       B. did .... Do              C. do....do