11. Since people are always not satisfied with their present situation, they
     want further development.
　　改进: Since people are never satisfied with their status quo, they want
     further development.
　　12. The only thing they need to do is to find a job which can easily get big
     money.
　　改进: The only thing they need to do is to find a job that can bring
     them big  money.
　　13. They like an active life but not a peaceful life.
　　改进: They like an active life rather than a peaceful one.
　　14. Some cigarettes may even cost a larger sum of money.
　　改进: Some cigarettes may cost even more.
　　15. Firstly, dissatisfaction encourages the discovery of new products.
　　改进: Firstly, dissatisfaction encourages the invention of new products.
　　16. Insgroupsto suit the needs of enteringsintoswork, students must grasp
     some technical skills.
　　改进: Insgroupsto meet the needs of future work, students must learn some
      practical skills.
　　17. It is very necessary more qualified scientists and technicians.
　　改进: Qualified scientists and technicians are in great demand.
　　18. This knowledge will become a part of your body.
　　改进: This knowledge will become part of you.
　　19. They cannot think clearly.
　　改进: They cannot think straight.
　　20. Money can improve their living standard.
　　改进: Money can improve their life.