(23) 
A.model
B.imitate
C.repeat
D.shadow

(16)  
A.controlling
B.handling
C.doing
D.playing

(12) 
A.task
B.operation
C.service
D.role

According to the passage, which of the following is TRUE?
A.The number of amphibians is decreasing rapidly.
B.The number of amphibians is increasing.
C.The number of amphibians is going up.
D.The number of amphibians staying constant.

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