3. Find the necessary ending to the following sentence.

1. The best economy is achieved when an ail-purpose earth-moving machine is designed...

2. A scraper is simply a box made of sheet steel with an open mouth...

3. Site preparation and leveling are...

4. It is not possible to start on a construction job...

5. The use of expensive mechanical plant requires...

A. ...with out a good deal of preliminary leveling the site.

B. ...the most fully mechanized of all the operations in building construction.

C. ...carefull planning and efficient site organization.

D. ...capable of being converted to suit any class of work.

E. ...which is dragged along the surface of the ground until it is full.