They’ve arrived at the flooded areas, but we don’t know ________ they got there.

______________it is raining hard, they are still working in the open air.

opinion, Jack, though relativelystubborn, was not too difficult ___.

Let’s go to the concert tonight, Michael!—Sorry, I _______. I have to help my mother with the housework

__________ entered the office when he realized that he had forgotten his report.