Chia đúng dạng từ trong ngoặc: I (not / study).......... hard last semester, so I ( not / pass ) did not pass the examination last weekend

1. I (not / study).......... hard last semester, so I ( not / pass ) did not pass the examination last weekend
2. Mai ( write ) .............. the letter to her friends twice a week when she ( be )............ far from her .
3. Nam ( achieve ) .............. the frist prize for several time.
4. Duy ( go )............ abroad in 2020. We last ( see ) ...........each other is november,2020
5. They ( play )............. football in this field since afternoon they ( be / still / play )..............
6. Thu ( come )............... to london since her parents ( decide )........... to move there.
7. The teacher ( celebrate ).............. graduation party when we ( finish )................ this period.
8. Thanh ( work )........... for this company since She ( graduate )