Shut down the computer when we are through with it; put it ———— when we leave it for a while.

How can we help to reduce greenhouse gases when using computers?

When we leave we say: _____.

When we are about to leave the room, we can say:____.

A、

Good-night and have a pleasant evening,madam.

Thank you.

See you later.

I really appreciate it.

When we leave the room at night ,we should ______ the lights.

A、

turn on

turn down

turn off

turn over