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1. Read the following sentences and decide what sentence expresses the main idea of the text.

1. Home building industry is the concern of the state.

2. The building industry comprises skilled and unskilled workers in many trades.

3. Building industry which includes residential, public and industrial construction is being carried out on a large scale and it has brought into being new methods and techniques.

4. There is a marked improvement in the heating and ventilating systems as well as in hot-water supply.