-- I’m sorry we ________ all the educational CD-ROMs. Can you come next week?-- Please call me as soon as the latest one _________.
I think your advice is of great ________ to me and it’s _______.
-- Look at that girl. Is it Susan?--No, it _______ be her. She has gone back to her home town .
________ great progress he has made this term ! He feels _______ .
To live a low-carbon life , we must try to save _____ energy and produce ____ carbon .
--Which do you prefer, Simon ,tea or milk ?-- ______ is OK . I don't mind .