—Maggie, why did you take a bus today?
—Oh, I forgot to tell you about that. My bicycle ______ yesterday.

—Someone is knocking at the door. Who ______ it be?
—It ______ be Victor. He went to London yesterday.

When the firemen arrived, the fire had been ______

—______ city Rio de Janeiro in Brazil is！
—Yes. The 3lst Olympic Games will be held there.

Thanks for your ______. It really helped me a lot.