Запишите и переведите предложения, обращая внимание на функцию инфинитива (Infinitive).
1. Our intention was to expand the production and to increase the output of coal by 20 per cent.
2. The drill to be used for this operation was being constructed for several years.
3. To explain the problem the professor mentioned some facts from his life.
4. People use discoveries to satisfy their needs and to improve the environment they live in.