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-- Look at the boy running on the ground. Is it David?

-- It _______ be him. I saw him go to the teacher’s office just now.

---I was told to be here at this time.

---Sorry, you ___________. I forgot to tell you we've changed the plan.

一Is the woman in white our manager?

一It _________ be her．She has just left for Shanghai．

A．must         B．may              C．can’t             D．couldn’t

 -- Hangzhou Xiaoshan International Airport. I’ll be there by 10 a.m.  

-- ________, but I’ll do my best.

   A. No problem       B. All right              C. I can’t promise      D. It’s impossible