题目内容
At midnight, he drove through streets ____ of traffic.
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His time at university was the most ____ period of her life.
He was cut ______ in his prime by cancer.
In the future, the discovery which will most change the lives of people, most affect the health of the world, and ______ the drug industry is the cure for the common cold.
The role of the party system in American politics has always been ______.
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