6. A new system of quality control was brought in to overcome thedefects in the firms products.
A) invested
B) introduced
C)installed
D) insisted
7. During the past ten years there have beendramatic changes in the international situation.
A) permanent
B)powerful
C) striking
D) practical
8. It is out of the questionthat the inspector will come tomorrow.
A) impossible
B) possible
C)probable
D) likely
9.Techniques to employ the energy of the sun are being developed.
A)convert
B) store
C) use
D) receive
10. The most crucialproblem any economic system faces is how to use its scarceresources.
A)puzzling
B) difficult
C) terrifying
D)urgent
11. Cement was seldom used in building the Middle Ages.
A)crudely
B) rarely
C) originally
D)occasionally
12. Medicinedepends on other fields for basic information, particularly some of theirspecialized branches.
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