1. The money was given back to him last Sunday.
2. These exercises can't be done quickly by Nga.
3. The bill has to be paid before the first of the month.
4. You will be aksed some questions.
5. The box has been locked and I can't open it.
6. The report has been finished by noon.
7. That silly thing shouldn't be done.
8. Some exercises are done by Nam every day.
9. English is taught by the new teacher.
10. That machine hasn't used for ages.
11. All the eggs have been eaten.
12. My briefcase has been taken.