Jim had just stepped out of the bathroom and was busy drying himself with a towel ______ he heard the steps.
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.
Nancy, sweep the classroom, _______?
—Would you like some more noodles, Celia? —Yes, just _________, please.