all kinds of difficulties,the workers have made rapid progress in the construction of the World Expo 2010 Shanghai.
Be quick, _____ we’ll be late for school.
— 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.