=>
1. Our exercises are corrected at home by the teacher. 
2. My car is going to be serviced by a mechanic tomorrow because it was damaged severely by yesterday's storm. 
3. Several new schools are being built in our town. 
4. Great progress has been made in industry, science and medicine.
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 been opened for the past hundred years. 
9. Are these letters going to be mailed by you soon? 
10. The report should have been finished by him yesterday. 
11. Researches on sida began to be carried out by scientists two years ago. 
5. Tea can't be made with cold water. 
6. All the workers of the plan were being instructed by the chief engineer. 
7. Some of my books have been taken away. 
8. The meeting will be held before the May Day. 
9. The engine of the car has to be repaired. 
10. The window has been broken by the boys and some pictures were taken away. 
11. Money is spent on advertising everyday. 
12. This room may be used for the classroom. 
13. More trees should be planted to prevent some natural disasters. 
14. Some raincoats had been bought before we heard the weather forecast.