（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.
