Mark the letter A, B, C,or D on your answer sheet to show the underlined part that needs correction.
A professor of economy and history at our university developed a new theory of the relationship between historical events  and financial crises.

A.economy

B. developed

C.between

D.financial crises

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

A professor of (A)economy and history at our university (B)developed a new theory of the relationship (C)between historical events and (D)financial crises.

A. economy

B. developed

C. between

D. financial crises

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

A professor of  economy and history at our university developed a new theory of the relationship between historical events and financial crises.

A. economy

B. developed

C. between

D. financial crises

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

This theory is based on the  principles of physics, chemists, and  mathematics

A. on

B. principles

C. chemists

D. mathematics

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.

A basic (A) knowledge of social studies, such as history (B) and geography, are (C) considered a basic part of the education of every child. (D)  

A. basic 

B. history

C. are 

D. child.