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

II. Mark the letter A, B, C, or D to indicate the word that dfffers from the other three in the position of the primary stress in each of the following questions.

A.organization                        
B.enthusiastic             
C.compassionate        
D.qualification

__________(5)
A.look
B.throw
C.like
D.love

According to the last paragraph, _______.
A.species extinction has no relationship to human beings
B.what threaten plants and animals can do nothing to human beings
C.human beings depend on natural resources to survive
D.not every, species has a role in the circle of life.

 Without gravity, everything would float.
A.If there had been no gravity, everything would float.
B.If there had been no gravity, everything would have floated.
C.If there was no gravity, everything would float.
D.If there was no gravity, everything would have floated.

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

A.competent
 
 
B.computer
C.compliance
D.commuter

Select the synonym of the following bold and underlined word in each sentence in the unit
We read newspapers and magazines which have been produced on computers.
A.born 
B.shaped 
C.begun 
D.manufactured

Choose the best answer among a, b, c, or d.
I was just ......... to go out when you telephoned
A.around
B.about
C.thinking
D.planned