阅读下面短文，掌握其大意，从方框中选择适当的词并用正确的形式填空。

strive for greatness          wipe out             die out            be committed to be to blame                 in one's attempt to          get ahead       up to       in short take action               set so apart            at risk of            boil down to

Human beings are no stranger to extinctions, where entire species 【小题1】. In the last 500 million years, there have been five times when life on Earth has almost ended. According to scientists, we are now entering the Earth's sixth mass extinction, for which human activity will 【小题2】.

There is a long list of reasons why so many species 【小题3】: pollution, deforestation, farming and overfishing. It is clear that human activity has negatively affected all other species on Earth. If a sixth mass extinction occurs, scientists believe that 【小题4】 three quarters of all species on Earth could become extinct. In turn, as we humans depend on so many species for our survival, we would also be 【小题5】 extinction.

However, it's not too late to 【小题6】 now. We need to take steps to set up nature and wildlife reserves, make good use of wind and solar energy, and reduce our carbon footprint. 【小题7】, if we want to survive, we need to stop destroying the planet that we live on and start to protect it.