31. A large sum of money has been raised for the ____________ of the poorly-educated children in the mountainous districts.
I have no doubt in my mind______ they will be glad to see me.
With the help of high technology, many new substances(物质)______in the past years.
I’m certain David’s told you his business trouble. ________, it’s no secret that he owes a lot of money to the bank..
---- Will Joe attend the party? ----- If his wife won’t go to the party,_________.
----- Can I go back home now? ----- You______ to leave until you ______ your work.