________ on a novel written by Robert James Waller, the film the bridges of Madison Country has been popular all the time.
If the American government the expert’s suggestion, the world economy would not be in such a mess now.
He had hardly reached home _______ an unexpected guest came to visit him.
Had they known what was coming next, they ___________ second thoughts.
I don’t know how it ___________ that our car was bumped from behind.
—How do you like your trip to Hainan? —________,I enjoyed it very much,although the weather was hot sometimes.