Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Câu 1: When a country in an early stage of development, investments in fixed capital are vital.
A. country in
B. investments
C. fixed
D. are vital
Câu 2: Bacteria that live in soil and water play a vital role in recycling carbon, nitrogen sulfur, and another chemical elements used by living things.
A. soil and water
B. a vital role
C. another
D. living things
Câu 3: Genes have several alternative form, or alleles, which are produced by mutations.
A. several alternative
B. form
C. which
D. produced by
A.
B.
C.
D.