根据句意和汉语提示，填写恰当的短语完成下列句子。

1. They'll return _____ (马上).

2. Could you please _____ (打扫干净) the room?

3. Would you like to _____ (与……聊天) others when you travel by train?

4. I'm sorry I couldn't _____ (过会与……通话) you sooner.

5. You are supposed to _____ (关掉) your mobile phones when having meetings.