1, Many countries have already been using solar energy.
2, Saving energy is one of the best ways to conserve our natural resources.
3, At present, most of our energy comes from using coal, gas, oil or nuclear power.
4, Planting tree creates shade around our house helps to keep cool.
5, This power could be provided by the Sun.
6, Don't leave the fridge open to let the cold air escape because it uses a lot of energy.
~~~~~~~~~~~~
Chúc bạn học tốt :3 Mình xin CTLHN+TIM Ạ !!!!!!

=>
1. Many countries are already using solar energy.
2. Saving energy is one of the best ways to conserve natural resources.
3. At present, most of our electricity comes from the use of coal, gas, oil or nuclear power.
4. Planting trees creates shade around your house and helps keep it cool.
5. This power could be provided from the sun. 
6. Don't leave the fridge open because cold air escapes and this uses a lot of electricity.