1. The construction of the tunnel was almost finished by them.
2. The results of the experiment is being discussed by them.
3.Concrete structures are used while erecting the new railroad bridge.
4.Cement will be brouhgt by lorries to the construction site after lunch.
5. This kind of fuel is not used by them because it is very expensive.
6; Have the new equipment been already installed? 
7. The experiment will be completed by them in a month.
8.The road under the Channel  have been tunnelled by the workers. 
9. The engine will be tested by the mechanic when he repairs it.
I0. As a rule,  one great discovery is followed with numerous discoveries.
II. The experiment were being finished when the device broke down.
12. Muchh attention is also paud to the quality of materials for road construction.
I3. The engineers were asked by the students about the new construction technologies.
14. All labour-consuming and dangerous workwill be done with machines of new generation in the future. 
15. Our professor has been regarded by the International Committee  for his outstanding theory. 
16. The industrial revolution  was accelerated  with the development of machine-tools .