It was announced that only when the examination papers were handed in ________to go out of the classroom.
— Jane, is this your umbrella?—No, it’s not _____. I didn’t take one this morning.
Three million _______ a large number. You can make it _______.
Over fifty countries _______ the AIIB(亚投行) so far.
—Excuse me, madam. Could you please tell me _________ the bus arrives?—Sure. At 9:00.
We stopped _________, but there was not any sound.