It ___ be the postman at thedoor It’s only six o’clock

(2009浙江宁波质检)¾It’s getting dark, but Mr．Johnson is still at his office．¾No surprise．Who else can ______ he does?

We are confident that the step the Chinese governmenthas taken to cope with the current crisis is ______ of great significance

n’t believe John won the first prize at the speech competition, ______

What doyou mean _________ saying that I’m lucky