I don’t know when my son ________ back. When he_________ back, I’ll call you.
—_____ do you go to the cinema? — Once a month.
— Must I finish the work today? — No, you _____.
Betty will ring me up as soon as she _____ in Shanghai.
Mr. Smith came to our school in 2003. He _____ here for 10 years.
Some boys of Class One enjoy _____ pop music.