--Is the man standing outside the teacher’s office Mr. Zhou?  --No, it ______ be him. He has gone to Hong Kong for an academic conference. 

It_____ have been Tom that parked the car here, as he is the only one with a car.

— Who’s that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.

It’s funny that Howard___ speak to you like your boss. 

(2013·东北三校二模)—In case anyone ________ come in my absence, tell him I will be back soon.—Sure, I will.