从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
1. Research _______ that over 90 percent of high school students are dissatisfied with their test scores.
A. indicates B. introduces C. dictates D. determines
2. It ______ me that I should treat myself a dinner after such an exhausting examination.
A. happened B. struck C. occurred D. took
