Global warming is a big _______ for all and it’simportant to raise awareness about climate change

Has Mr Lee arrived?— No.But it’s already 9 o’clock.He should________at any time. [ ]

Is it so important? He just asked me casually about it ________ a drink.[ ]

Would you mind my _______ the window — _______. There’s too much smoke in the room.

227. It is necessary that the question_______ at once.