Drinking and driving is one of the most common (causes) of traffic accidents.
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He is an expert in (crisis) management .
A. 危机
B. 潜力
C. 欺骗
D. 推迟
Membership has (swelled) to over 20 000.
A. 摇摆
B. 增加
C. 减少
D. 堕落
Your efforts will (make a difference).
A. 改变
B. 不同
C. 热情
D. 有影响
we should (be smart about) using the internet.
A. 极大地
B. 细小地
C. 有计划地
D. 巧妙地