—Who____ it be that is knocking at the door? —It ____ be Father, but I’m not sure.
Peter received a letter just now ________ his grandma would come to see him soon.
The poor man , ________,ran out of the dark cave.
He asked us to him ______ carrying through their plan.
His report was so exciting that it wasinterrupted by applause(掌声).
I sight of an empty seat at the back of the bus and went directly there. A. lost B caught C. looked D. took