The headmaster was______ as to how to inform her of the news that her daughter failed to pass the exam again.
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