--- I’d like to introduce my best friend to you , Peter .---- Thank you , Lucy . But we __________already .
—Peter , don’t run in the hallways .--________.
—Is your father at home ?—Yes, he _______ in the living room
—Hello ! May I speak to Jenny ?--________.
Bill can play_____violin but he can’t play _____chess.
We don’t know that Sally’s mother for half a year in London .