The two Chinese scientists have made a wonderful discovery, which marks a major _______ in the basic research in the field.
A. reform B. approach C. boundary D. breakthrough
The incident caused a hot discussion on the Internet, but the local government had no immediate _______ on it.
A. adjustment B. commitment C. comment D. document
The hip-pop singer is always drawing attention to issues that are usually ignored. That’s ____ is so great about him.
A. that B. what C. all D. how
With the world changing fast, we have something new _____ with all by ourselves every day.
A. deal B. dealt C. to deal D. dealing
—Have you been to the Great Wall?
—Perhaps not in my memory. ________, it might have been during my early childhood.
A. If any B. If so C. If ever D. If not
The question that puzzled them is ____ they can get rid of the air pollution in the area.
A. how is it that B. that how C. what is it D. how it is that
