—Morn, must I clean my room now?—No, you     . You can do it in the afternoon.

— Is there an express to Beijing tonight? — There ______ be, but you’d better call the booking office to make sure. 

It             be the vocabulary that caused you the problem in the exercise because you know a lot of words.

My newly- purchased bag is nowhere to be found.____ I have left it on the bus?

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