You’d better_______ your cigarette when you are in the wood.
This pair of jeans ________ them 300 dollars.
Not only he but also his parents _____China for two years .
--Never forget to bring your homework with _______.--__________.
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 .