Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best first each of the numbered blanks from 16 to 20.

Nowadays people are more aware that wildlife all over the world is in (16)______ . Many species of animals are threatened, and could easily become (17)_______ if we do not make an effort to protect them. In some cases, animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, are caught (18)______ and sold as pets. For many animals and birds the problem is that their habitat - the place where they live - is disappearing. More land is used for farms, for houses or industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them to grow better crops, but these chemicals pollute the environment and (19)______ wildlife. The most successful animals on earth - human beings - will soon be the only ones (20)______, unless we can solve this problem.