11. Since people are always not satisfied¹ 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. Firstly², 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 practical³ skills.

　　17. It is very necessary more qualified⁴ scientists and technicians⁵.
　　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

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