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
