Будівельний майданчик

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On large construction sites where a considerable volume of concrete is required

a central mixing plant is generally used.       [true, false]

A bulldozer is an earth-moving machine which planes off a thin layer of soil,

picks it up, and carries it where required.       [true, false]

The tower cranes are employed for lifting materials and structural elements onto

the buildings being erected.       [true, false]

The first revolving shovels were mounted on railway tracks and powered by

steam.       [true, false]

Site preparation and excavation are operations which are usually carried out with

manpower.       [true, false]

A scraper is simply a large box fitted with a cutting edge that digs.       [true, false]

Since excavators are heavy and slow-moving machines, they are carried from

site to site on special transporters.       [true, false]

Are the excavators fast-moving machines?

Site preparation and excavation are labour-consuming operations. At present they

are the most fully mechanized of all the operations carried out in building

construction. But earth-moving machines are heavy and slow-moving units;

therefore they must be carried from site to site on special trailers. It is clear that

such expensive mechanical plant as excavators must be made to carry out various

classes of work.

Find the necessary ending to the following sentence.

1.                                [As the years went on... , To carry out this work..., During the last fifty years...]one must use earth-moving equipment.

2.                                     [Planing off a thin layer of soil..., The amount of digging operations..., Plant for site preparation]can be divided into four classes.

3.                    [A scraper is, A bulldozer is, A revolving shovel]an earth-moving machine, which carries out its work with the aid

of a blade mounted on a tractor.