Mum, ______ is my friend Peter.

Now many people are________ in playing_______ games on the Internet.

Tom, why did you make no reply when I called your name in the street just now?—Sorry, Jim. I to my wife on the phone.

Listen! Is Mary playing the piano in the room? –No. It ________ be Mary. She has gone to Hong Kong.

He has _______the cup ______water.