(30)
A.knowledge
B.know
C.known
D.knowledgeable

(4-require)____
A.requisition
B.required
C.requirement
D.requisite

(3)
A.exchanged
B.changed
C.transferred
D.converted

(5)
A.enthusiast
B.enthusiastic
C.enthusiasm
D.enthusiastically

(7)
A.divorced
B.divorce
C.had divorced
D.have divorced

(1- high) ______.
A.highly
B.highland
C.height
D.highness

(10)
A.turn on
B.turn off
C.turn down
D.turn into

(12)
A.understand
B.understood
C.has understand
D.were understood

(13)
A.Rather
B.Still
C.Instead
D.Yet

(15)
A.terrify
B.terrifying
C.terrified
D.terrifies