-- Who is dancing to music in the next room?-- ________ the children.

They produced four reports, _______ of which contained any useful suggestions.

—Do you have   ready for the graduation ceremony，Ted?—No，we still have to find a famous speaker.

 — Would you like _________ to drink?— An iced coffee, please.

 Mr. Alcott, headmaster of the school, refused to accept made by the Students' Union.