She ______ a sister ______ us.
____________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.
--Do you know ________ this dictionary belongs to? --Let me see. Oh, it’s __________.
A foreign visitor is coming to visit our new house this evening. My mother will offer him _______ to eat.