---Must I go to medical school and be doctor like you，Dad？--- No, you __________, son. You’re free to make your own decision. 

Just imagine performing such an opera as Turandot in the Forbidden City---there _____ be a better setting! 

－Why are you looking so worried? Is there anything I can do for you?－The computer        break down when I nearly finished my composition.

She ________ come to the party, but I am not quite sure.

—Look at the picture on the wall. It ________be David’s.—Yes, his name is on the first page.