—Listen! Peter is singing in the classroom!—It _____ be him. He has gone back to his hometown.
Drinking some water and milk ______ very good for you.
Beethoven wrote _______ beautiful pieces of music.
She _______ the waitress ten dollars for lunch.
--_________ do you have an English party?--Once a month.
--Do you know Lin Shuhao?--Yes, he is famous ________ playing basketball __________ a basketball star.