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 amounts of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably.

A. vary

B. almost always

C. The amount of

D. stable

Mark the letter A, B, C, D on your answer sheet to show the underlined part that needs correction.

The amount of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably.

A. vary       

B. almost always   

C. The amount of          

D. stable

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.

Alike (A) oxygen, which is chemically (B) changed by our bodies into carbon dioxide, nitrogen is  merely (C) exhaled back into (D) the air.

A. alike

B. chemically

C. merely

D. into

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.

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.

Almost (A) of the trees (B) in this plantation have been (C) cut down and (D).

A. Almost 

B. trees 

C. have been

D. and 

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.

Providing relief after the disaster necessitated the mobilization of vast amounts of food, medical supply, and people.

A. Providing 

B. vast amounts

C. medical supply

D. people

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.

Providing(A) relief after the disaster necessitated the mobilization of vast amounts (B) of food, medical supply(C), and people.(D)

A. providing

B. vast amounts

C. medical supply

D. people