peon / small potato /
                     Big potato / big shot / big bug/ biggie
Irrelevant  adj.His remarks are irrelevant to our topic
illegal 非法的（il+legal 合法的）* illegal drugs / illegal deals 非法毒品/交易
illiterate 不識(shí)字的（il+literate 認(rèn)字的） --- literature 文學(xué)
illogical 不合邏輯的（il+logical 邏輯的）

In the U.S. 88 percent of smokers had started before they were 18, despite the fact that it is ________ to sell cigarettes to anyone under that age.
A) liable        B) liberal
C) irrational       D) illegal

8．Memorable adj. 值得記憶的
詞根：memo- 表示記憶
Memorable adj 值得記憶的--難忘的 = unforgettable
Memory n.
Memo 備忘錄
Memorial n. 紀(jì)念館
Remember v.
  Commemorate v. 紀(jì)念  * This monument commemorates our victory.
                      這座碑是紀(jì)念我們勝利的。

  According to the key witnesses, a peculiarly big nose is the criminal’s most memorable facial ________.
A) feature       B) hint
C) spot        D) signature

 F. W. Woolworth was the first businessman to erect a true skyscraper to ________ himself, and in 1929, A1 Smith, a former governor of New York, sought to outreach him.
A) portray       B) proclaim
C) exaggerate       D) commemorate

9. Interrupt :
前綴： Inter – 在中間
J Inter – 在…之間,相互
Interaction n. 相互作用 / 互動(dòng)   chemical interaction 化學(xué)相互作用
International
Interpersonal ,    interpersonal relationships人與人之間的關(guān)系
Interrelate v. 相互關(guān)聯(lián)
Intervene v.  vene-走 – 走在兩者之間 à 干涉
Interchange v. 相互交換