We ................................... leave the lights on.
should / shouldn't
What should we do?
We should organise a carpool.
......................................... is a good idea.
Having clean-up days
What's this?
greenhouse
We ...................................... throw away rubbish.
shouldn't/should
I am going to ........................ instead of non-renewable sources of energy.
use solar energy
You should....................... when you leave the room.
turn off the light
What should we do?
We should start a compost bin.
What should we do?
We should collect rainwater.
R..................... is good for our environment.
Recycling