题目内容

After he was attacked, he managed to ________ to the phone and call for help.

A. . pound
B. . turn
C. . stabber
D. . stagger

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The more they ________ into his background, the more inflamed their suspicions would become.

A. . researched
B. . probed
C. . examined
D. . explored

Universities have offered ________ business courses to respond to students' demands for more business knowledge.

A. . optional
B. . conservative
C. . voluntary
D. . temporary

The stock price fluctuations have sparked the investor’s concern about insider trading and market ________.

A. . transaction
B. . management
C. . manipulation
D. . treatment

AIDS has become one of the first killers to human beings. Despite their lack of success so far, scientists have ________ in their research for a cure for AIDS.

A. . suspended
B. . retained
C. . insisted
D. . persevered

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