—Have you ___________ been to Beijing? —Yes. But only once.
It's very nice ________ you to get me two tickets ______the World Cup.
_______bad weather we are having !We've never had_______ rainy days.
____________the window. What's happening there?
____________of the twins passed the exam because they worked hard at their lessons.
—I think the man over there must be Bob. -- It _______ be him. He has ______ to Australia.