the ten question were the same as that the author made up the day before exam
Kolb教授的试卷使作者感到惊讶,因为这十个问题与作者在考试前一天编造的问题相同。
空格前是连词because,所以这里需要填一个完整的句子,并根据原文内容解释作者感到惊讶的原因。