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.