Mark the letter A, B, C,or D to show the underlined part that needs correction.
Câu 1: A number of (A) teachers have (B) devoted their lives (C) for (D) the development of education in Viet Nam.
A. A number of
B. have
C. lives
D. for
Câu 2: The assumption that (A) smoking has bad effects (B) on (C) our health have been proved (D).
A. that
B. effects
C. on
D. have been proved
A.
B.
C.
D.