scientists are trying to out the ways to reduce pollution from aircraft

I'll ____ you ____ lớn our research department. Please hold on.

No wonder the vacuum cleaner isn't working. You haven't ____ it ____.

Whoever ____ up with that idea should have won the Nobel Prize.

____ is a branch of Natural Science, and is the study of living organisms and how they interact with their environment 

A/ an ____ species is a population of an organism which is at risk of becoming extinct. 

Besides, several programmes should be ____ that spreads the world of the conservation of the elephants in the public.

Cheetah's tail is ____ during fast running, because it balances the animal and allows fast and sudden turns which happen often when the prey tries lớn escape. 

People should be told about the things that threaten the safety of ____ ví that they can avoid doing them.

Humans depend on species diversity lớn provide food, clean air and water, and fertile soil for agriculture.

The more you talk about the situation, ____.

____ the Sun is, ____ the shadow is. 

Life on Earth is disappearing fast and will continue lớn tự ví unless urgent action is taken. 

By December next year, we ____ in this house for twenty years.

____ it is, ____ miserable I feel.

The saola is also indirectly threatened by insufficient ____ lớn and investment in its conservation.

The better the weather is, ____.

Hunting for meat and burning forests for soil cause destruction lớn wildlife. 

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

I think I ____ my door key. I can't find it anywhere. 

Only a few of the many species at risk of extinction actually make it lớn the lists and obtain legal ____.

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