精选训练：2015年6月大学英语六级语法练习（5）
29. The director gave me his ________ that he would double my pay if I did my job well.
A) warrant
B) obligation
C) assurance
D) certainty
30. The Christmas tree was decorated with shining ________ such as colored lights and glass balls.
A) ornaments
B) luxuries
C) exhibits
D) complements
31. The two most important ________ in making a cake are flour and sugar .
A) elements
B) components
C) ingredients
D) constituents
32. Cultural ________ indicates that human beings hand their languages down from one generation to another.
A) translation
B) transition
C) transmission
D) transaction
33. We must look beyond ________ and assumptions and try to discover what is missing.
A) justifications
B) illusions
C) manifestations
D) specifications
34. No one imagined that the apparently ________ businessman was really a criminal.
A) respective
B) respectable
C) respectful
D) realistic
35. If nothing is done to protect the environment, millions of spedes that are alive today will have become ________ .
A) deteriorated
B) degenerated
C) suppressed
D) extinct
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