12. These companies are famous for having done __________________ work in human relations.
A. obvious
B. outstanding
C. minor
D. minimum
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Great as Newton was, many of his ideas ________________ today and modified by the work of scientists of our time.
A. are to challenge
B. have challenged
C. have been challenged
D. are challenging
We __________________ to start our own business, but we never had enough money.
A. have hope
B. hope
C. had hoped
D. should hope
16. He took down a square green bottle, ____________________ he poured into a dish.
A. its content
B. which content
C. the contents of which
D. the content of that
17. Once a class does not need to move at a ______________ pace , students can learn different things rather than all learning the same thing.
A. frequent
B. hasty
C. uniform
D. settled