Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

The primary causes of species extinction result _________habitat destruction, commercial exploitation and pollution. 

A. in

B. of

C. for

D. from

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Species become extinct or endangered for _______ number of reasons, but the primary cause is the destruction of habitat by human activities.

A. ∅

B. a

C. the

D. an

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Species become extinct or endangered for _______ number of reasons, but the primary cause is the destruction of habitat by human activities.

A. Ø

B. a

C. the

D. an

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Many species of wild life are      of extinction

A. at risk 

B. on the verge 

C. on the side 

D. in dangers 

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Today many species of plants and animals are in ______ of extinction

A. danger

B. endangered

C.  endanger

D. dangerous

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Many rare and precious species are now _______  the verge of extinction.

A. in

B. from

C. on

D. by

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Many rare and precious species are now the verge of extinction.

A. in

B. from

C. on

D. by

Mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the following questions.

Some species of rare animals are in _________ of extinction.

A. danger

B. dangerous

C. danger

D. endanger