Miss Li regards all her students _______ her children. 

—Is that boy Alan?—No, it ______ be him. He left for Beijing yesterday.

The soccer team has been doing well this season，so they       win the championship．

– Look at the lady there. ______ it be Miss Li? -- No, it ______ be her. She left for Paris this morning.

—It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.—I can't agree with you more. There ________ be errors for every single step.