---Look! That’s Amy.   ---It _______ be her. She’s gone to Xi’an.

In China when the traffic light is red, you ________ cross the road.

(2010·北京高考)—Good morning. I've got an appointment with Miss Smith in the Personnel Department.—Ah, good morning. You ________ be Mrs. Peters.

–Look at that girl! Is it Susan? --No, it _______ be hers. She has gone back to her hometown.

 —I don't really like James.Why did you invite him?—Don't worry.He ________ come.He said he wasn't certain what his plans were.(2011·北京)