【题目】our teacher begins to speak, we students should give him our full attention.
A.Normally
B.Mostly
C.Immediately
D.Approximately

【答案】C
【解析】我们的老师一开始说话，我们学生应该充分注意他。A. Normally”正常地“； B. Mostly” 主要地“； C. Immediately ”立刻，马上“； D. Approximately”大约'。此处Immediately（连词）"一.....就....."，引导时间状语从句，故选C。