8. Sulfur has occasionally been found in the earth in an almost pure state.
A. regularly
B. accidentally
C. sometimes
D. successfully
9. Many fine cooks insist on ingredients (成分) of the highest quality.
A. demand
B. rely on
C. prepare for
D. create
10. The company recommended that a new petrol station (should) be built here.
A. ordered
B. insisted
C. suggested
D. demanded
11. It hard for the young people to imagine what severe conditions their parents once lived under.
A. sincere
B. hard
C. strict
D. tight
12. They agreed to settle the dispute by peaceful means.
A. solve
B. determine
C. untie
D. complete
13. The police contended that the difficulties they faced were too severe.
A. argued
B. predicted
C. said
D. suggested
14. He expressed concern that the ship might be in distress.
A. despair
B. difficulty
C. need
D. danger
15. The most pressing problem any economic system faces is how to use its scarce resources.
A. puzzling
B. difficult
C. terrifying
D. urgent
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