Prove these statements, add some more information from the text

1. As for fuels we use for heating buildings, they include coal, oil, manufactured and natural gases. 2. Some time elapses between the moment the steam gives up its heat to the radiators and the time the cooling of the steam condenses it to water. 3. Industrial buildings often present special problems which the designers find most difficult to solve. 4. There are certain industrial processes we know to be accom­panied by the production of air-born dust. 5. Were all-year air-conditioning systems set up, all the processes required for winter and summer air conditioning could be performed. 6. Floor panel heating we so often find in one-story and base-mentless structures is of great comfort and low installation cost. 7. Some old concepts of heating were gradually changed since engineers obtained more precise knowledge about the heat the human body loses.

11. Compose pairs of words from English and Russian synonyms. Explain their meaning