6.She remains confident and ______ untroubled by our present problems.
A) indefinitely
B) infinitely
C) optimistically
D) seemingly

7.Fiber-optic cables can carry hundreds of telephone conversations ______.
A) simultaneously
B) spontaneously
C) homogeneously
D) contemporarily

8.The police were alerted that the escaped criminal might be in the ______.
A) vain
B) vicinity
C) court
D) jail

9.Whether you live to eat or eat to live, food is a major ______ in every family's budget.
A) nutrition
B) expenditure
C) routine
D) provision

10.Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars.
A) configuration
B) constitution
C) condemnation
D) contamination

11.There is much I enjoy about the changing seasons, but my favorite time is the ______ from fall to winter.
A) transmission
B) transformation
C) transition
D) transfer

12.I think we need to see an investment ______ before we make an expensive mistake.
A) guide
B) entrepreneur
C) consultant
D) assessor