The old couple decided to ____ a boy and a girl though they had three children of their own.
The first use of atomic weapons was in 1945, and their power ____increased enormously ever since.
–Have you heard the latest news?-No, what ____?
The father as well as his three children ___skating on the frozen river every Sunday afternoon in winter.
Not Tom, but I ___to blame for the failure.
All I have learned about the exam____ that three students faileD. A. is B. are C. will be D. have been