—Guess what?I have got an “A” for my term paper—___!You must have put a lot of work into it
The idea for the new machine came to Mr. Baker ______ to his invention recently.
Professor Liu has ________ teach psychology since he came to the Central China Normal University.
----Any news about Bill Clinton? ----He left power three years ago and has a little now and a little then been ______.
If you want to sell your product you must _____ it.
—Shall I open the window to let some fresh air in?. —No, ______.