__________(9)
A.if
B.whether
C.unless
D.although

VI. Choose the best answer A, B, C or D for each sentence:
She specializes in _______ novels set in eighteenth-century England.
A.history                
B.historian                 
C.historic         
D.historical

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best first each of the numbered blanks from 1 to 5.
Nowadays people are more aware that wildlife all over the world is in (1)______ . Many species of animals are threatened, and could easily become (2)_______ if we do not make an effort to protect them. In some cases, animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (3)______  and sold as pets. For many animals and birds the problem is that their habitat - the place where they live - is disappearing. More land is used for farms, for houses or industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them to grow better crops, but these chemicals pollute the environment and (4)______  wildlife. The most successful animals on earth - human beings - will soon be the only ones (5)______, unless we can solve this problem.
(2)_______
A.disappeared       
B.vanished    
C.extinct
D.empty

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best first each of the numbered blanks from 1 to 5.
Nowadays people are more aware that wildlife all over the world is in (1)______ . Many species of animals are threatened, and could easily become (2)_______ if we do not make an effort to protect them. In some cases, animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (3)______  and sold as pets. For many animals and birds the problem is that their habitat - the place where they live - is disappearing. More land is used for farms, for houses or industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them to grow better crops, but these chemicals pollute the environment and (4)______  wildlife. The most successful animals on earth - human beings - will soon be the only ones (5)______, unless we can solve this problem.
(5)______
A.left          
B.over  
C.staying    
D.survive

Choose the best answer for the following sentences:
He  had to explain the lesson very clearly…………………….
A.in order that his student to understand it 
B.so that his students  could understand it
C.so as his students to understand it      
D.so that his students to understand it

Choose the best answer to the following questions.
Mary will have finished all her work _______.
A.as soon as her boss returned   
B. until her boss will return
C.by the time her boss returns  
D.when her boss will return

_________(6)
A.so
B.too
C.also
D.such

___________(4)
A.special
B.possible
C.confident
D.sure

Choose the best answer to the following questions.
By the time he retires, he_______ $20,000.
A.will save   
B.has saved
C.had saved   
D.will have saved

Choose the best answer to the following questions.
When he comes, I_________ him the news.
A.tell
B.will tell
C.would tell   
D.would have told