The book proved to be very unreliable and so was quite _____ to him in his research.
A. invaluable
B. useless
C. negligible
D. unusable
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His career was not noticeably _____by the fact that he had never been to college.
A. prevented
B. restrain
C. hindered
D. refrained
The machine needs a complete _____since it has been in use for over ten years.
A. amending
B. fitting
C. mending
D. innovating
The statue would be perfect but for a few small_____ in its base.
A. mistakes
B. weakness
C. flaws
D. errors
He has failed me so many times that I no longer place my _____on what he promises.
A. reliance
B. belief
C. credit
D. faith