--- Who knocked the door? --- I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ______ was.
—She looks very happy.She_______have passed the exam. —I guess so.It’s not difficult after all.
We have every reason to believe that_______2008 Beijing Olympic Games will be_____success.
We haven't settled the question of ______ it is necessary for him to study abroad.
A poet and artist ______ coming to speak to us about Chinese literature and painting tomorrow afternoon.