–Mary, could you tell me if your mother _____ our school sports meeting tomorrow? --I think she will come to school if she _____ free.
Let’s open the windows to have some ______ air here.
--- When ______ you ______ here? --- Two days ago.
--- Will you carry the box for me, please? --- Sure, ______.
Basketball is so exciting that ______ people play it for fun.
Bob is taking the desks away because they ______ too much room.