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

Alike oxygen, which is chemically changed by our bodies into carbon dioxide, nitrogen is  merely exhaled back into the air.

A. alike       

B. chemically         

C. merely     

D. into

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.

Fuel is any substance or material that reacts chemically with another substance or matenal to produce hot.

A. any

B. hot

C. with

D. that reacts

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

The Earth is the only planet with a large number of oxygen in its atmosphere.

A. the

B. a large number

C. oxygen

D. its

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

The earth is (A) the only planet with a large (B) number of (C) oxygen in (D) its atmosphere.

A. the

B. number

C. oxygen

D. its

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 earth is (A) the only planet with a large (B) number of (C) oxygen in (D) its atmosphere.

A. the 

B. number 

C. oxygen 

D. its

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.

The world is becoming more (A) industrialized and the number of animal (B) species that have becoming (C) extinct (D) have increased. Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

A.  industrialized

B. species

C. extinct

D. have

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