33.many countries are using solar energy

34.at present,most of our electricity comes from the use(of) coal,gas...

35.turn off all the lights every time you leave (the) room

36.one percent of solar energy reaches to the earth is enough to provide the power for the total population

37.fossil fuels won't be burned for energy in the future

38.bạn đúng r

39.will our electricity bills be reduce....

40.in the countryside,people will burn plants to produce heat

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33. Many countries are using solar energy.
34. At present, most of our electricity comes from the use of coal, gas, oil or nuclear power.
35. Turn off all the lights every time when you leave the room.
36. One percent of the solar energy that reaches the earth is enough to provide power for the total population.

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37. Fossil fuels won't be burned for energy in the future.
38. Solutions will be found to reduce pollution in our city.
39. Will your electricity bills be reduced to 20% in five months?
40. In the countryside, people burn plants to produce heat.