20. He is _____ great ______.

他处于极度危险中。

19. We human beings could not survive ________all the plants and animals ________us.

18. Tigers which are ________danger of dying out, is ________the animals that need our help.

17. She turned round and there was an antelope(羚羊) ________a sad face looking ________her.

16. The chair rose again and almost ________once they were ________thick rain forest.

15. ________a result, farmers like us and no ________hunt us.

14. This is the animal that has disappeared ________the earth.

13. They can fly so far because ________the flying machine.

12. I will help you if you pay attention ________what I have said.

11. I believe that you are concerned ________animals and plants disappearing.