We should ( turn off / turn on ) the lights when we don't use.
turn off
You shouldn't ( save / waste ) water if you want to protect the environment.
waste
We should ( use / reduce ) public transportation.
use
We (should / shouldn't) use paper bags to the environment.
should
You should ( unplug / plug ) the TV when you don't watch.
unplug
We should ( cut down / plant ) trees because they produce O2.
plant
We ( should / shouldn't ) use solar energy.
should
You (should / shouldn't) recycle glass, metal or paper.
should
You ( should / shouldn't ) use eco-friendly bulbs to save electricity.
should
We ( should /shouldn't ) use filters because it reduces air pollution.
should
When you brush your teeth, turn off the .....
tap/faucet
Take a ________. Don't take a bath.
shower
Ride your _______ or walk to school.
bike
Recycle ________, newspapers, card and cardboard!
paper
Turn off the ________ when you leave the room.
light
Give old _________ to charity.
clothes
