We Chinese students usually have 8 weeks ______ in the summer holiday.
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 .
It’s very kind _____you to help me with my lessons. It is hard ____ me to learn them well .
--What do you think of _____talk he gave us yesterday?--Wonderful. I've never heard _____ better one.
-- Hi,Mike! I haven’t seen you for a long time. ? --- Everything is OK. Thanks.