---Which is more useful, chemistry or biology?
---I think _____ them are useful.
---May I speak to Bill,please?
---________
---Could I borrow your bike?
---Yes,of course you________.
---________I have some cakes now?
---No.you________.It's time for bed.
--- ________I take the book out?
--- Yes.but you________return it before next Thursday.
---Where does your father work?
---He works ____ a farm.
---What will you do next week?
---_________.
---What will our life be like?
---People will ____ long holidays and their working time will ____ short.
---Will students have more homework to do?
---________.