18.retire vi.退休→retirement n．退休→retired adj.已退休的

　　19.apply vi.申请 vt.应用→applicant n．申请人→application n．申请；应用

　　20.congratulation n．祝贺→congratulate v．祝贺　

　　21.entrance n．入口→enter v．进入→entry n．进入　

　　22.unfortunately adv.不幸地→unfortunate adj.不幸的→fortune n．幸运

　　23.contribute vt.捐献，贡献→contribution n．贡献→contributor n．捐助者；贡献者

　　24.seriously adv.认真地，真诚地→serious adj.认真的，严肃的

　　25.production n．生产，制造→produce vt.生产，制造→product n．产品 用所给词的适当形式填空1.After a few minutes our eyes got used to the darkness (dark)．

　　2.Something as simple as sharing thoughts openly can make a powerful (power) difference to one's health.

　　3.The biggest question is how they got into this mess (messy) in the first place.

　　4.After graduation (graduate), he went to work, first as a teacher, then government official.

　　5.The restaurant serves its customers well; in other words, its service is very good.(serve)

　　6.The contributor contributed a lot of money to the project; that is to say, his contribution was great.(contribute)

　　7.The medicine the factory produced had many side effects, which proved that the product was harmful. Therefore, the factory stopped its production.(production)

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