boost；prospect；defect；accelerate；speculate；undertake；invest；promote （1）Nature has ____ these animals with a capacity for not showing fear.（2）It has long been known that regular exercise ____ all-round good health.（3）Human activities can cause or ____ permanent changes in natural systems.（4）About 800 soldiers ____ from the eastern part of that country.（5）I think career ____ in science and technology are virtually unlimited.（6）The farmers hope that warmer weather and more rain will ____ their farm output.（7）This discovery has led scientists to ____ on the existence of other galaxies.（8）People should ____ risky action only after they have carefully considered its consequences.

Fill in the blanks with the words and expressions.Change the form where necessary.
boost；prospect；defect；accelerate；
speculate；undertake；invest；promote
（1）Nature has  ____ these animals with a capacity for not showing fear.
（2）It has long been known that regular exercise  ____ all-round good health.
（3）Human activities can cause or  ____ permanent changes in natural systems.
（4）About 800 soldiers  ____ from the eastern part of that country.
（5）I think career  ____ in science and technology are virtually unlimited.
（6）The farmers hope that warmer weather and more rain will  ____ their farm output.
（7）This discovery has led scientists to  ____ on the existence of other galaxies.
（8）People should  ____ risky action only after they have carefully considered its consequences.

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