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—I wonder why Mr Green hasn't showed up at the meeting yet.
—I'm not sure，but he________in a traffic jam driving here.

--- Tom , why didn’t you answer my call yesterday afternoon?
--- Sorry , I didn't hear the phone . I ___________ asleep.

Being constantly exposed to advertisements is annoying, but it ______ be pleasant sometimes.

As it turned out to be the most important meeting in the year, you ____ so casually.

Doctor Wang      at seven o’clock for the conference, but she didn’t turn up.

— Can I pay the bill by check?
— Sorry, sir. But it's the management rules of our hotel that payment ______be made in cash.

--- Mary’s got crazy and has been sent to the mental hospital. Did you tell her boss about that?
--- Yes, but I _____ her husband first.

—I hear you’ve got a new iPhone 4S. ______ I have a look?
—Yes, certainly.

Doctor Wang      at seven o’clock for the conference, but she didn’t turn up.

One of our rules is that every student ______wear school uniform while at school.