（一）destruct , destructive(ness), destruction; destructible(ness)/destructibility
      Constructive, instructive
(1) a destructive storm
(2) Those anticancer drugs are effective, but also destructive to white blood cells.
(3) Corruption will finally be destruction of our whole society.
(4) destructive/constructive criticism
(5) Drug taking was his destruction.
a destruct ional plain 侵蚀平原

（二）Affection, affectionate(ly), affective, affectation, affect
Affect illness/indifference/an American accent
Without affectation, make an affectation of interest  
An affected smile,

（三）perceive, perceptive, perception; perceptible/perceivable, perceptibility; perceptual
Perceive, perceptive(ness); perceptivity
perceptual knowledge/response to

(1)He is a man of great perception/perceptiveness./He is a perceptive man.
a perceptive eye/ perceptive comments
(2) a perceptive audience
  To devote a perceptive chapter to corruption
He is kind and _________ about others.
(3) There was a _________ smell of coffee coming out of the kitchen.
(4) There are barely ___________ differences between the twin sisters.

（一）destruct , destructive(ness), destruction; destructible(ness)/destructibility
      Constructive, instructive
(1) a destructive storm
(2) Those anticancer drugs are effective, but also destructive to white blood cells.
(3) Corruption will finally be destruction of our whole society.
(4) destructive/constructive criticism
(5) Drug taking was his destruction.
a destruct ional plain 侵蚀平原

（二）Affection, affectionate(ly), affective, affectation, affect
Affect illness/indifference/an American accent
Without affectation, make an affectation of interest  
An affected smile,

（三）perceive, perceptive, perception; perceptible/perceivable, perceptibility; perceptual
Perceive, perceptive(ness); perceptivity
perceptual knowledge/response to

(1)He is a man of great perception/perceptiveness./He is a perceptive man.
a perceptive eye/ perceptive comments
(2) a perceptive audience
  To devote a perceptive chapter to corruption
He is kind and _________ about others.
(3) There was a _________ smell of coffee coming out of the kitchen.
(4) There are barely ___________ differences between the twin sisters.