_________ unknown quantities is the task of algebra.
A.To found  
B. Find  
C.The find
D.Finding

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
 

A.suppose                  
B.signal                      
C.student                    
D.problem

Some of the people can’t find a seat in the concert hall.
A.There weren’t enough seats for all the people in the concert hall.
B.There were enough seats for some people in the concert hall.
C.There are some people without a seat in the concert hall.
D. There weren’t enough seats even for some people in the concert hall.

A.control
B.remote
C.purpose
D.respond

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

A.sharp
B.hammer  
C.apple
D.applicant

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
“We gave them the money yesterday, but we haven't received a receipt yet, ______?’’ she asked her husband.
A.didn't we
B.have we
C.did we
D.haven’t we

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
I never thought that I could win a prize.
A.It never dawned in me that I could win a prize.     
B.I was never put off from winning a prize.
C.It never crossed my mind that I could win a prize.
D.I never had full advantage of winning a prize.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
            The environment is everything around us, both natural and made by man. A major problem in the world today is the destruction of the natural environment. This is a complicated problem.
            We burn fuels, and this causes air pollution. We throw away plastic bags, containing toys and other objects. Unlike paper and wood, they will exist long in the environment. We have made thousands of new chemicals. Factories that make or use chemicals always have chemical wastes. These are often poisonous, and they also stay in the environment.
            Since 1945, several countries have been testing nuclear bombs in the air and underground. The explosions in the air cause nuclear fallout. The fallout causes cancer and kills animals and people. Nuclear power plants that make electricity also produce dangerous wastes and have accidents that can be very disastrous.
What does the word "these" in the second paragraph refer to?
A.chemical wastes
B.poisons 
C.factories 
D.new chemicals

Choose the best answer.
………….. the parcel, he was surprised at what he saw.
A.To open           
B.Have opened
C.Opening
D.When opened

Choose the best answer to complete the following sentences.
Helen couldn’t get the experiment to work for ages, but in the................it was fine.
A.last      
B.future     
C.end   
D.opinion