A. establish
B. conserve
C. produce
D. endanger
A. destroy
B. destroying
C. destroyer
D. destruction
A. could
B. can
C. might
D. was allowed to
A. appearance
B. protection
C. extinction
D. destruction
A. into/ at
B. in/ to
C. to/ on
D. into/ onto
A. fauna
B. flora
C. flowers
D. vegetation
A. run out
B. run off
C. run of
D. run away
A. could have eaten
B. would being eaten
C. was eating
D. could eat
A. have working
B. worked
C. have been working
D. had been working
A. which is well-known
B. well-known
C. which well-known
D. is well-known
A. to replace
B. replacing
C. to be replace
D. replace
A. whom Mr. Davis teaches them
B. which Mr. Davis teaches
C. that Mr. David teaches them
D. Mr. Davis teaches
A. became
B. have become
C. become
D. are becoming
A. The author believes that the rainforest will survive.
B. The author believes that preserving the rainforest is important to global ecology.
C. The author believes that he can predict the future of global ecology.
D. The author believes that the extinction of species is a natural process.
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