| 1. Strengthening metals means reinforcing them with artificial fibres. | Their being reinforced with artificial fibres makes them more corrosion resistant. |
| 2. Using atomic fuel for the production of electricity is one of the most promising sources of energy. | Atomic fuel has great possibilities. Its being used for the direct production of electricity is one of the most promising. |
| 3. Our professor likes inviting young specialists to take part in his researches. | But he avoids being invited to take part in their own researches. |
| 4. We are no longer surprised at watching a telecast from outer space. | We are no longer surprised at telecasts being shown from outer space. |
| 5. We can’t use these pieces of metal in the process without hammering them into thin sheets. | These pieces of metal can’t be used in the process without being hammered into thin sheets. |
| 6. Metallurgists are developing new processes by producing metals and alloys that meet the present-day requirements. | Some kinds of paints allow the metal to stay under water for several years without being repainted. |
7. Much effort is being given to find the most efficient means of generating electricity.
8. The aim of these measures is raising standards of service.
9. Supplied with books and scientific equipment the young scientist began experimenting.