Drivers should stay ___ while on the road, keeping an eye out for bikes or other vehicles.
Afierce
Balert正確答案
Canxious
Dinitial
答案與詳解
alert 意為「警覺的、警醒的」,stay alert 是固定用法,與後句 keeping an eye out(留意周遭)語意一致。
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