Today is Wednesday. He _______ be at home. He _____ be at school.

Walking exercises ____ be boring at times, but on a clear sunny morning nothing could be better．

What do you mean, there are only ten tickets? There _________ be twelve. 

You’d better take another flight to New York , for the AA 505 Flight ______ have been cancelled. But you should call the airport to make sure. 

--- Mum, could I play with my classmates for a while after I finish my homework? --- _______. But you must come back before supper.