If we _______ the water, we will have no fresh water to use.
A.pollute
B.preserve
C.save
D.recycle

(26) 
A.but
B.so
C.because
D.since

III. Choose the answer A, B, C or D to complete sentences.
The older you are,                                 .
A.the more you may become worried  
B.the more worried you may become
C.the more worry you may become      
D.you may become more worried

III. Choose the answer A, B, C or D to complete sentences.
Loss of habitat and increased commercial hunt                       the number of chimpanzees from 2 million to 300,000 individuals.
A.reduced
B.lessened
C.weakened
D.limited

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.convenient
B.endanger
C.critical
D.tradition

III. Choose the best answer to each of the following questions.
If we don't protect these rare species, they                by 2030s.
A.die out     
B.will die out      
C.will have died out   
D.have died out

II. Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
The fire will go out unless we put some more wood on.
A.go off   
B.go in       
C.stop burning           
D.flare up

They were fortunate to have rescued from the fire before the building collapsed.
A.fortunate
B.rescued
C.from
D.collapsed

I. 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.potential
B.production
C.promotion
D.psychology

I hope that this winter won't be______ last.
A.as cold than
B.so cold as
C.so cold like
D.as cold like