1. Read the text and decide if the statements below are true (t) or false (f).

1. On large construction sites where a considerable volume of concrete is required a central mixing plant is generally used. ( )

2. A bulldozer is an earth-moving machine which planes off a thin layer of soil, picks it up, and carries it where required. ( )

3. The tower cranes are employed for lifting materials and structural elements onto the buildings being erected. ( )

4. The first revolving shovels were mounted on railway tracks and powered by steam. ( )

5. Site preparation and excavation are operations which are usually carried out with manpower. ( )

6. A scraper is simply a large box fitted with a cutting edge that digs ( ).

7. Since excavators are heavy and slow-moving machines, they are carried from site to site on special transporters. ( )