1) I should turn off all the lights , fans before leave the class and use it sparingly, effectively.
2) I will turn off some lights or some unnecessary things to reduce electrical energy, save energy.
3) Use energy-saving light bulbs such as LEDs, fluorescent lamps, incandescent lamps, ...; do not use air conditioner much; use smart switches; Wash with cold water.
4) Yes, I do. Because it's very simple, lightly and not expensive for all students to go to school every day.
5) Yes, I do
Chúc bạn học tốt!! ^ ^