3 The light will be turn off when leaving  a room or go to bed

4 offered

5 will be usedư

6 will be increased

7 will be blulit

8 will be solved

câu 3

-the lights will be turned off when leaving a room or going to bed

câu 4

-A great deal of energy will be offered by wind power next century.

câu 5

-Sources of energy will be used more effectively for our future.

câu 6

-The use of biogas will be increased in the countryside for cooking.

câu 7

-a hydropower station will be built in the North of the country next decade

câu 8

-the problem of energy shortage will be solved by using solar energy