1. Our exercises are corrected at home by the teacher.
2. I was given a wonderful present from Alice.
3. Several new schools are being built in our town.
4. Researches were carried out on SIDA by scientists two years ago.
5. A lion was killed by Sam last week.
6. Your report must be handed in before the end of this month.
7. The job had just been finished by me when the factory closed.
8. That box hasn't opened for the past hundred years.
9. Are these letters going to mailed by you soon?
10. The report should have been finished by him yesterday.
16 . c
17.b
