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.
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

Governments have ________ laws to protect wildlife from over-hunting.
A.enforced                           
B.enacted                        
C.observed                     
D.required

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Mr Pike _________ English at our school for 20 years before he retired last year.
A.was teaching
B.has been teaching
C.is teaching
D.had been teaching

Nobody has come to see us since we...............
A.had lived
B.lived
C.are living
D.have been living

Thank you very much . I haven’t been to ------------- party for ages. 
A.so enjoyable 
B.a so enjoyable
C. the so enjoyable
D.so enjoyable a

A.mysterious  
B.particular 
C.biodiversity    
D.announcement

There is a mistake in four underlined parts of each sentence. Find the mistake:
If you came to my party yesterday, you would have seen your former friend.
A.If
B.came to
C. seen
D.former

Mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the following question.
The           of the radio by Marconi played an important part in the development of communication.
A.invention
B.discovery
C.development
D.research

Jack: "Why don't we go out? You looked tired".
Tom: "_________".
A.Not at all    
B.Thanks         
C.That's a good idea 
D.Not my problem

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A.laughs         
B.problems     
C.nights          
D.markets