When the great new dam has been built it ______ (supply) power for a third of the country’s requirements.The dam ______ (take) ten years to build and the course of the river ______ (change).At present,twenty thousand workers ______ (employ) and by the time the dam ______ (complete),it ______ (cost) millions of pounds.As many people have had to leave their homes,the government ______ (build) new villages for them.The great dam ______ (improve) living standards.In future,farmers ______ (produce) more than half the country’s needs; new factories ______ (build) and the whole country ______ (have) an adequate supply of electricity.