11、Since people are always not satisfied with their present situation，　they want further development.

    改進：　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.　

    改進：　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.

    改進：　They like an active life rather than a peaceful one.　

    14、Some cigarettes may even cost a larger sum of money.　

    改進：　Some cigarettes may cost even more.　

    15、Firstly，　dissatisfaction encourages the discovery of new products.

    改進：　Firstly，　dissatisfaction encourages the invention of new products.　

    16、Insgroupsto suit the needs of enteringsintoswork，　students must grasp some technical skills.

    改進：　Insgroupsto meet the needs of future work，　students must learn some practical skills.

    17、It is very necessary more qualified scientists and technicians.

    改進：　Qualified scientists and technicians are in great demand.

    18、This knowledge will become a part of your body.　

    改進：　This knowledge will become part of you.　

    19、They cannot think clearly.

    改進：　They cannot think straight.

    20、Money can improve their living standard.　

    改進：　Money can improve their life.