Students are ____for new knowledge to suit themselves to the future jobs in various fields_______ which they are unfamiliar.

The government should develop          system to predict when wildfires occur andgive warnings in time.

As the economy is getting better and better，there are more and more jobs _______．

Once out of the earth’s gravity, the astronaut is________ by the problem of weightlessness.

This small mountain village is so perfect a place for holidays that visitors never leave it _________.