1. fair adj. 公平的→fairness n. 公平→反义词unfair 2. skill n. 技能→skills(复数) 3. typical adj. 典型的→typically(副词) 4. quick adj. 快的→quickly(副词) 5. continue v. 继续→continued(过去式) 6. compare v. 比较→compared(过去式) 7. development n. 发展→develop(动词) 8. push v. 推→pushed(过去式) 9. cause v. 引起→caused(过去式) 10. usual adj. 通常的→usually(副词)→unusual(反义词) 11. waste v. 浪费→过去式wasted 12. provide v. 提供→过去式provided 13. depend v. 依赖→过去式depended→independence n. 独立 14. develop v. 发展→development n. 发展→developing adj. 发展中的→developed adj. 发达的 15. ill adj. 生病的→illness n. 病 16. drop v. 掉落→过去式dropped 17. independent adj. 独立的→independence n. 独立、自主 18. clear v.