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4. Choose one of the best beginning (a, b, c) to the following endings.

1. ____________ one must use earth-moving equipment.

a) As the years went on...

b) To carry out this work...

c) During the last fifty years...

2. ____________ can be divided into four classes.

a) Machines, which plane off a thin layer of soil...

b) The annual amount of digging operations...

c) Plant for site pre­paration and excavation...

3. ____________ an earth-moving machine, which carries out its work with the aid of a blade mounted on a tractor.

a) A scraper, which belongs to the second class of earth-moving machines, is...

b) A bulldozer is…

c) A revolving shovel, which belongs to the third class, is...