59.　　 proposal n. – propose v. 　　[s]arrive v. – arrival n.　

58.　　 product n. – production n. – produce v.　　 (receive a proposal)　 protect v. ---protection n.

57.　　 possible a. – impossible　 [s]polite a. –impolite a.　 patient,　 impatient

P开头的词常常 +”im”构成反义词

56.　　 pleased a. – pleasant a. – pleasure n. (with pleasure 求你帮助 VS　 my pleasure感谢你

55.　　 participate v. – participation n.　

54.　　 operate v. – operation n.　 *operate on　 　

53.　　 obey v. – disobey v.

52.　　 murder n. – murderer n.

51.　　 living n.& a. – live v. –alive a.　

alive a.表语或后置定语（be alive /creature a live ）

living a.前置定语　 n. 生计　 make a ~　　 living things =creature　

lightning n.　 light v. ( lit, lit)　 lighted a.

50.　　 lead v.　　　 leading a.