You .shouldn't.... waste electricity.
She ..should... recycle old newspaper into good paper.
Matthew shouldn't..... turn on the TV before leaving the house.
You should..... buy recycled paper.
He ..should... use rechargeable batteries more than normal batteries.
You .should.... drink milk in a papercup.
We ..... should consider the opinions of others before choosing to wear animal fur.
She should..... use old clothes for cleaning floor.
You .should.... walk to the mailbox at the end of the driveway instead of driving.
Ken shouldn't..... use a lot of paper.