I. Не очень понятно, какой круг грамматических тем охватывает упражнение, но если только времена (без модальных глаголов), то:
1. was reading
2. was looking
3. brought
4. had never been
5. found
6. is not working
7. is studying
8. will be studying
9. looked
10. were tidying
II.
1. The dishes are washed by me every day.
2. The letter will be sent to him by us in a day.
3. The flowers haven't been looked after by you properly.
4. A new school is being built in our microdistrict.
5. This task can be done by everybody without any difficulty.