It suddenly _____ him that he had taken the wrong bus.
One of the requirements for being admitted to the University is that you __________ the English test organized by it.
With a lot of difficult problems __________,the newly-elected president is having a hard time. A, settled B. settlingC. to settle D. being settled
So many uses have been discovered for this wood __________ the supply of white pine is becoming smaller and smaller.
—I wonder why Mr. Green hasn't showed up at the meeting yet. —I'm not sure, but he __________ in a traffic jam driving here.
__________ your timely warning, we would have been unaware of the danger.