1. Our exercises is corrected by the teacher at home.

2. A wonderful present was given to me by Alice.

3. Several new schools are being built in our town

4. Great process has been made in industry, science and medicine by us.

5. A lion was killed by Sam last week.

6. Your report must be handed in by you before of this month.

7. The job had just been finished by me when the factory closed.\

8. That box hasn't been opened for the past hundred years

9. Are these letters mailed by you soon?

10. The report should have been finished by him yesterday

11. Researches on SIDA are begun to be carried out by scientists 2 years ago.

12. He is said to be the richest man in out town

13. I can assure you everything will be arranged in time

15. Nothing has been moved since you were sent away to be cured. 

16C 17C 18A 19A 20C 21A 22B 23B 24C 25A 26A 27D 28C 29D 30D