The problem seems to be ..................
A. more serious
B. more serious than
C. more serious as
D. more and more serious
Đáp án đúng: A
Dịch: Vấn đề có vẻ nghiêm trọng hơn rồi.
Albert Einstein’s contributions to scientific theory were ................ those of Galileo and Newton.
Both are informative articles, but this one is ................ .