Using the information from the text, write a short summary.
4.Insert necessary prepositions:
a) Central heating is more common in the United States than … most other countries.
b) A typical fireplace allows enough warm air to escape … the chimney to empty an average room every few minutes.
c) But air pollution caused … smoke from wood- burning stoves has become a problem … some places.
d) Most wood-burning stoves are made … heavy castiron or steel.
Text 1
Heating.
Heating. The development of efficient indoor heating systems has made it possible for people to live and work in places far from the warm parts of the world. Without such heating systems, people must spend too much of their time and energy combating winter cold in the temperate and frigid zones of the earth.
The first heating systems were open fires in crude caves. When human beings discovered a way to dig a hole in he side or top of a cave to let out the smoke, the first fireplace was developed. Later on, these fireplaces were provided with separate chimneys. After such fireplaces came stoves made of brick and tile, and then of cast iron. Finally, central heating systems were developed. These systems are used in many homes, office and industrial buildings, and schools today. Special heating systems for automobiles, trains, ships, and airplanes enable people to travel comfortably in cold weather.
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