You can turn on the air conditioner before you go home or turn off the light after you leave through the smart phone.
举一反三
- When you leave the room,you must___. A: turn on the light B: to turn on the light C: turn off the light D: to turn off the light
- Turn off the light before you （） A: leave B: left C: had left D: is leaving
- (Be sure to) turn (off) the light (before) you leave. Yes, I'll (turn off it). A: Be sure to B: off C: before D: turn off it
- A：Must I turn off the light when I leave? B:No, _____. A: you mustn't B: you can't C: you needn't
- Which one is the correct etiquette ? A: Keep the mobile phone in power. B: Mute or turn off the mobile phone before the interview. C: If somebody calls you during the interview, you have to pick up the phone. D: You can play with your mobile phone in the interview.