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Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

5. Flower oils are ............................. of the ingredients used in making perfume.

A. among expensive                                                                        

B. among the most expensive

C. being most expensive                                                                        

D. very expensive

6. I met a lot of new people at the conference ............................. names I can't remember.

A. whose                        

B. which                                       

C. who                                       

D. whom

7. The little boy failed to give ............................. reason for his absence from school last Monday.

A. satisfactory                

B. suitable                                       

C. adequate                                       

D. right

8. I will lend you the book providing that you ............................. it not later than Sunday.

A. will return                 

B. return                                       

C. is returning                                       

D. returned

9. It is ............................. to fail a job interview, but try again.

A. disappoint                                                                        

B. disappointing

C. disappointedly                                                                        

D. disappointment

10. New York Harbour, ............................., is one of the largest and finest harbours in the world.

A. where is ice-free in all seasons

B. that is ice-free in all seasons

C. which is ice-free in all seasons         

D. it is ice-free in all seasons there

11. The last family ............................. was on the occasion of grandma's birthday two years ago.

A. anniversary               

B. collection                                       

C. meeting                                       

D. gathering

12. Last month two terrible storms ............................. the central provinces of Viet Nam.

A. struck                        

B. collapsed                                       

C. erupted                                       

D. buried

13. Cold temperatures, short growing seasons, and heavy snows prevent ............................. at high elevations.

A. grow trees                  

B. trees are growing              

C. trees growing                  

D. trees growth

14. ............................. is helping to break new ground in drug research.

A. Computers are being used more                          

B. When using computers more

C. If an increase in the use of the computers                 

D.The increasing use of the computer