—Is Nancy knocking at the door?—No, it ________ be Nancy. She has gone to Guangzhou.A. can’t B. mustn’t C. won’t
–How come ___________?—I had to look after my sick brother.
–Would you like _________? –Thanks, I am full.
Since we have a new friend here, why not ____ a party _____ next week?
Tom looks ________, for he hardly ever exercises ____ his free time.
--________ does your father visit your grandparents a week? –Once.