When the door is open, the fridge uses extra energy.We should turn off the lights and the taps if we don't need them.
For example we should be quick when getting the food out of the fridge.
If they refuse to do it, I pick up their rubbish myself.
They usually feel very uncomfortable about it and never do it again.
Solar energy can help grow vegetables and fruit, light cities and keep our houses warm without using gas and oil.
The energy from gas and oil pollutes the environment, and the energy from the sun and the wind doesn't.2.
SAMPLE ANSWER People discuss environmental problems a lot nowadays.