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.

There have been a report of several bombings by terrorist group.

A. have been

B. several

C. bombings

D. terrorist

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. 

Genes have several alternative form, or alleles, which are produced by mutations.

A. several alternative

B. form

C. which

D. produced by

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.

(A) Before the invention of (B) the printing press, books (C) have been all printed (D) by hand.

A. Before 

B. the printing 

C. have been

D. by hand

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.

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.

Hardly he had graduated from Vietnam Naval Academy when he joined Vietnam Coast Guard.

A. he had    

B. graduated from  

C. when       

D. joined

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.

I think we have sufficient enough  information to write the report.

A. sufficient enough  

B. information

C. write

D. the report