—I’m sorry to have kept you waiting.—Oh, not at all. I ______here for only a few minutes.
You can only tell the news to Tom,Jack and Bill,and __________ it should be kept.
I’m afraid none of us can __________ the machine that has been imported from abroad.Which of the following is wrong?
In Britain,sales of cigarettes have been reduced __________ 30% in the past ten years.
Whenever you are to walk on the ice,__________ that it is solid and safe enough.
It is a __________ that you missed such a wonderful concert.