—I regret to say that I failed to rank first in the terminal exam.—Come on，nobody ________ win all the time.

---.Look! It _____be your uncle .----It_____ be him . He has gone to Xi’an.

—May I take photos in the museum? —No, you        . You       obey the rules here.

 You ______be tired after working for eight hours without ______ a rest.

You ______ to the meeting this afternoon if you have something important to do.