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. The amount of

B. almost always

C. stable

D. vary

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 or D on your answer sheet to show the underlined part that needs correction in each of the following questions

Medical research indicates that large amount of histamine can be responsible for colds, hay fever, and other respiratory reactions

A. amount 

B. can 

C. colds 

D. respiratory

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

A large amount of popular expressions in our language have interesting backgrounds

A. A large amount

B. expressions

C. have

D. backgrounds

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The destructive force of running water depends entirely almost on the velocity of its flow

A. destructive force 

B. running 

C. entirely almost

D. of its flow

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Pure sodium immediately combines with oxygen when is exposed to air.

A. immediately

B. combines

C. is exposed

D. to air

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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

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A huge amount (A) of tourists (B) come (C) to this city (D) every year

A.A huge amount

B.tourists

C.come

D.to this city

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

Almost lemons grown in the United Ststes come from farms in Floria and California.

A. Almost

B. grown

C. come

D. farms