---There is somebody knocking at the door. Who________ it be?---I’m not sure. It ________ be a postman.

—Could I invite my friends to my birthday party?—Sorry, you ______.

---Can people drive after drinking a glass of beer?---No. According to the law they _________.

— Must we wear our school uniform this afternoon?— No, you. All of us will go on an outing.

--- Can you spell your name, please?--- Yes, I _________.