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.

Some bacteria are extrern_ely harmful, but others are regular used in producing  foods.

A. extremely harmful

B. producing foods

C. Some bacteria

D. regular used

Mark the letter A, B, C or B on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

The effects of cigarette (A) smoke has (B) been proven to be (C) extremely (D) harmful.

A. cigarette 

B. has 

C. to be

D. extremely 

Mark the letter A, B, C or B on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

(A) The effects of (B) cigarette smoking (C) has been proven to be (D) extremely harmful.

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.

Nearly (A) chemical agents are harmful (B) to living tissues (C) if enough of them is taken (D).

A. Nearly 

B. are harmful

C. living tissues

D. is taken

Mark the letter A, B, C or B on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Our students are (A) obedience and (B) hard-working, (C) but they are mischievous (D) sometimes

A. obedience 

B. hard-working

C. but 

D. sometimes

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 know you are upset about breaking up with Tom, but there are plenty more               

A. horses in the stable

B. cows in the shed 

C. tigers in the jungle 

D. fish in the sea 

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.

These exercises look easy, but they are very relatively  difficult for us

A. These exercises

B. easy

C. very relatively 

D. for